Is OTHER wrong in the post ? POST : So basically on Sunday we went to my fiancé’s parents to celebrate his sister’s birthday. The whole time we were there she mocked me in various ways(my religion, the holidays I take and our car) and no one said a word to make her stop. 

I was very hurt by it but kept my cool until we got home where I explained to my fiancé exactly why I was hurt and he offered to talk to his parents to see what was wrong as she has never acted like this before(which I agreed was fair). 

He spoke to his mother and asked her what was up with his sister and was told basically in their church(different branch of the same tree to my religion) there had been some women who had celebrations happening soon and she hadn’t been invited to any of them and had felt left out. 

AITA for when I found out having no sympathy for it. I feel it wasn’t my fault they cut her out and it wasn’t fair for her to take her anger out on me? I feel like my fiancé wants to forget it but I feel I am owed an apology especially as this was nothing to do with me. 

Half of me thinks she may not have been invited as she doesn’t have a job that pays well and she may have not been invited as they knew she wouldn’t be able to afford it and they didn’t want to either make her feel bad (or more likely in my opinion) have to deal with her bile about things costing too much. (On Boxing Day she made many comments to her family about how people spending over £50 per person on a hen night was obscene and that when she goes to weddings she doesn’t buy them anything not even a card which I find disgusting as these people have paid money for you to come for you to not even buy a card to thank them) 

Am I the Asshole in this situation or are we both in the wrong? 