Aita For Going To My Exs Family Christmas Gathering

We divoreced 6 years ago, the public reasoning was he claimed i was cheating because my cars feature when my phone is sync it has txt messages go to the car while im driving so he decided to read those and came to the conclusion i was cheating from onesided conversations (only shows txt recieved)that were not actually in order just when recieved while driving.

Despite him constantly being caught talking to other girls at night while i was pregnant and sleeping, smoking pot (before it was legal) in the house while i was pregnant against my wishes and when i gave birth he decided i should be an obedient STAHM and do everything arojnd the house. I had post partum depression and it made things very hard. He lost his job about a year after and i started working i was also still required to do all the cooking cleaning and evenjng care taking (6months in) (this is when divorce started) so when he made those acusations i just left, he would leg me see my daughter for 2 weeks and i have never really forgiven him. He also spent many years trying my make everyone hate me, tell people lies about me, refused to pay child support and acts like hes just the most perfect person. I juts carry on doing my own thing and being nice to his family despite all of this. His mother would help le out from time to time and he didnt like it (along with other issues they had together) he eventually stopped talking to her despite her efforts. Because i was the only way she could see her grandbaby we started to get along very well, we help eachother regularly and have formed a close relationship. This Christmas she invited me to have Christmas with her side of the gamily, and since i dont have a family to spend hollidahs with i thought our daughter would live that. So we went. His sisters (knew ahead of time) were so rude to me and acted as if i did not exist but also didnt talk to their niece much and told her that they didnt bring any presents for her. And shes have to get them from her dad (dont know if she did) and since then i have been wondering if i was the asshole or should i bring it up to her dad because even though he hasnt said anything to me about it, it most likely is his fault. And i dont care if they dont like me however i do believe the should be civil and respectful towards me since all i wanted was for my daughter to have a family Christmas and i go out of my way to ha e a decent relationship with his family tegarless of how i feel of them personally. Should i be feeling upset? Similar experiences?