My SIL “hates white people” and brings it up every time I am around.

I love my in laws, they are great. My sister in law particularly is very rude though. The last time I saw her before today she told me I looked old( I was postpartum and still up all night and breastfeeding 24/7) and was shoving all of the restaurant cups on the table into her pockets and purse at the family dinner. Every single time I see her she always says she hates white people and she can’t stand being around white people. My husband is half black half white, as is she. Both raised by only their white mother and white grandmother. But me and my husband have two kids- who are 75% white. I do not like it when she talks like this in front of my children. I have a 4 year old and a 1 year old. I wonder how they might be affected by this. I don’t like being around her much anymore because of this anyways.