How do I tell my brother that his wife is an a**hole and I don’t want to talk to her.

My sister-in-law used to be so cool with me. It was fun to be around her when I visited their part of the State. We had some deaths in the family, recently, so seeing them a lot and she did something really disrespectful to me (I don’t think she was realizing it at the time) in front of my entire extended family. Which later caused a lot of strife for me with family members.

Since then she totally ignores me and or acts like … I don’t even know how to describe it… like I’m some sort of chump. I’m always friendly and normal bc, that’s who I am and I didn’t do anything wrong to her.

My brother, her husband is always cool with me. Well, they are coming for a short visit and the way she treats me makes me feel terrible, like only family can do.

I don’t even want to deal with her. I want to say something to my brother but he of course will be on her side. I want to say something to her, too except why bother with someone who shows me no care?

How should I approach this? Thanks

TLDR : Bro & Wife are coming to visit and I can’t stand her anymore after disrespect and silent treatment from her. How can I tell my bro I don’t even want to deal with her?