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“Don’t judge a book by its cover” is one of the first life lessons we learn as children. For the most part, it’s about looking past seemingly unappealing superficial traits to know the real person beneath them. 

The saying can also work the other way around. Sometimes, we need to be wary of the overly pleasant person who may actually be hiding something sinister from within. 

This was a topic of discussion in a recent Threads post, where people discussed the telltale signs of a covertly dangerous person masking themselves behind niceness. If you have trouble reading people, you may learn a thing or two just by scrolling through.

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#1

57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act One of the biggest giveaways is when their kindness is conditional. They seem generous and respectful only as long as they get admiration, attention, or obedience. The moment they’re told “no,” criticized, or rejected, they become manipulative, guilt-tripping, angry, or quietly vindictive. Genuine kindness doesn’t disappear when expectations aren’t met

drsheraz55 , Federica Giacomazzi Report

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    #2

    When they weaponize personal things you shared when they pretended to be caring and curious.

    jessa_stargirl , ufabizphoto Report

    #3

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act They always see themselves as the victim, family, love, friendship. Like really pity trap you

    iyagiraresa , aldiozzz Report

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    #4

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act They self proclaim themselves as a nice guy

    jacquidavis88 , fabrikasimf Report

    #5

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act If they try to make you feel guilty for setting a boundary.

    davidsketchy , Dev Asangbam Report

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    #6

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act When they treat someone badly who they perceive as less powerful/important than them, e.g. waitstaff, skycap, usher, janitor, etc. Dead giveaway.

    skeptical_laughter_junkie , Getty Images Report

    #7

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act When the answer of "no" on anything for any reason is taken as a prompt to try a different strategy rather than to stop.

    ona_c_right , Polina Zimmerman Report

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    #8

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act Always describe their exes as the problem and the psycho, no accountability.

    sage.sempre , Alex Green Report

    #9

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act Words without matching actions

    haphazard.homesteader , drobotdean Report

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    #10

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act It takes 1 second for them to get very angry

    tir_ana__ , Getty Images Report

    #11

    Weaponizing therapy speak

    imperfectidealist Report

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    #12

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act Mimicking and mirroring your every move but so well you feel your a match.

    wave_softruth , Matheus Câmara da Silva Report

    #13

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act When they infantilize you! Run! It’s a supremacist jerk!

    User , Gabriel Ponton Report

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    #14

    When they say they want their woman to be submissive and feminine

    sunflourhour , reewungjunerr Report

    #15

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act They lead with talking about how different and misunderstood they are

    User , Timur Weber Report

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    #16

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act Lack of accountability for even the smallest error. Run.

    monicalintottphd , Budgeron Bach Report

    #17

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act When everything in their life that fell apart has an explanation that absolves them of any and all fault.

    tristanquebecois , Yan Krukau Report

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    #18

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act He wants to know all the ways you’ve been “hurt” in your life.
    It sounds empathetic.. but hes not…he’s studying his prey.

    cindakay333 , Andrej Lišakov Report

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    #19

    The way they treat you when they don't find you attractive

    laamalainen Report

    #20

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act Before they do something wrong, they start listing reasons WHY the person deserves it, it’s icky.

    yadigee , Daiga Ellaby Report

    #21

    They get mad at you when you take too long to trust them.

    layla_solis2025 Report

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    #22

    Mansplaining. It’s a sign they need to know more than you about everything. Good luck getting them to admit they are wrong

    terry_fm_mn Report

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    #23

    When they laugh at someone getting hurt, or at the idea of gratuitous violence.

    baboone2011 Report

    #24

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act I think one of the biggest tells is whether their kindness can survive a loss of control. I’ve seen people that seem extraordinarily nice as long as everyone around them is behaving in ways that keep them comfortable. You can learn a lot by watching who they become when they don’t get to control the outcome.

    danielleinkc_aesthetic , Getty Images Report

    #25

    Sometimes the most dangerous person in the room is the one who worked the hardest to convince everybody they’re the safest.

    haydee_b_ Report

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    #26

    They get upset when the attention is off of them or they don’t receive validation for every idea they have

    User Report

    #27

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act When they call women “crazy.”

    panayiotabertzikis , Andrej Lišakov Report

    #28

    Always blaming others

    fabienne.joy Report

    #29

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act When they’re performative, on the outside they seem charming just great all around but underneath they lack empathy, accountability, deflect, gaslight, use others as opportunities, will lied steal and cheat. They will be a perpetual victim of every failed relationship always rewriting the story for the “nice guy” to get pity. Confront them or have boundaries and EGO, arrogance and pride will reveal the nastiness underneath. The true them

    trinapualani , Meg Aghamyan Report

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    #30

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act It all comes out when they get mad about something. How they deal with conflict or dissatisfaction or disappointment…that’s where the truth of them is.

    sflo823 , Alena Darmel Report

    #31

    Trying to separate themselves from men in general. Like “most men aren’t like me” or “I would never” type of talk.

    User Report

    #32

    When they always seem to have just the right thing to say in the beginning of your relationship - they want what you want, etc.

    colorful_dreams22 Report

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    #33

    When they only want men to be masculine and women to be feminine, and judge those who are different from that.

    User Report

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    #34

    When they speak with obvious compliments that contain veiled negativity. Smiling as they try to take you down

    decrumpe , branin Report

    #35

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act Benevolent sexism and paternalism, the masks of coercive control and hurtful behavior.

    imanii4u , Getty Images Report

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    #36

    Lacks vulnerability and empathy.

    lonan_aedan Report

    #37

    Says he only wants female friends to protect them, acts like a nice guy to get close to women, but secretly only collects women he finds attractive to see if any buy into his "I'm a catch, I'm not like other men" persona. Plot twist, he's very much like other men, and worse.

    maribones3 Report

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    #38

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act Performative religion, love bombing, and saying they’re a “good guy” and not a traitor

    neenerkikajotk , Enoch Wafula Report

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    #39

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act The smile never reaches their eyes.

    jeiunspoken , Getty Images Report

    #40

    They aren't a "nice guy" in private.

    foxwoodfaerie Report

    #41

    Women in their past relationships broke their heart...cheated on them etc.
    Before you know it, the "cute" jealousy starts....but it's disguised as care.

    meeerasvirtue Report

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    #42

    Everyone tells you that he’s a great guy but your gut tells you to run.

    kelley_and_matt Report

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    #43

    When they are extremely pushy about anything in a passive aggressive manner. The firm no is the trigger.

    user Report

    #44

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act They never express that they are angry, sad, disappointed. They are always “ok” and “fine” and “good”. These types of nice guys are DANGEROUS because they have made a habit of lying and their code/frequency is stuck at “inauthentic” and that makes them more likely to lie to you, gaslight you and make your authenticity a challenge to their ego.

    minilikemouse , Theo Decker Report

    #45

    Everyone was charmed by him, but you couldn’t get close to him or form a genuine connection. He was a narcissist.

    enirobo7 Report

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    #46

    Claiming to be healed masking suppressed trauma.

    User Report

    #47

    Any self proclaimation of good qualities repeatedly. The eyes as well. A lot of “good guys” have dead eyes.

    lanakris1317 Report

    #48

    If he ever says "I'll tell you what..." and then offers some minor favor dressed as a major kindness, RUN.

    susanemiletancraitor Report

    #49

    They mask their words as appearing articulate but at the end of the day they are just gaslighting you with lies about who you are to make you feel less than. When you go to someone in a shared circle for help they do not believe you because the man seems so articulate to them.

    kim_beatha Report

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    #50

    Immediately trying to "lead" without assessing alignment.

    nuanced_ash Report

    #51

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act When they say that, they're a man of God

    sunflourhour , ΘSWΛLD Report

    #52

    They ask inappropriate personal questions right off the bat. Immediately attempting to test boundaries.

    helenagirl9 Report

    #53

    I went on a dinner date once with a guy who said, “I’ll never cheat on you”, out of the blue. I stood up and said “You won’t get a chance” and drove myself home!

    tinaslo Report

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    #54

    The second you feel uncomfortable being yourself around them. The moment you feel yourself having to tone police a word or two or defend an idea with too much veracity. We are on a first date sir! I didn’t think I needed to bring my laptop and a dissertation for proof of my knowledge.

    soapbox_siren Report

    #55

    They never reveal their flaws

    ms_maxine82 Report

    #56

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act Too polite, kind and sweet to the point of causing diabetes to the other person

    User , Priscilla Du Preez 🇨🇦 Report

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    #57

    57 People Reveal The Sneaky Red Flags That Prove Someone's Kindness Is Just An Act Christian anything on bio.

    obladicraft , NordWood Themes Report

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