My mom is a bit racist and I want to change that

She is very open about her dislike for many white people. When I was little I was only allowed to play with black dolls, if someone got me a white doll she'd take it back or exchange it for a black one. However she has white friends that she does love a lot and visits often.

When I asked her why she hates whites so much she said she doesn't hate them, she just hates how many of them still treat us. For example we are currently in Newark and when we were trying to get on the elevator with 2 white ladies one jumped so fast the close the elevator door and laughed when she saw we wouldn't make it... My mom cursed her out later when we saw her again, I would have just let it go. If that lady wanted to be weird that's her problem but my mom says that white people still think they can treat blacks like dirt. My argument is not every white person is like that. She doesn't listen to me when I talked like that so now I just agree with her.

I believe the true reason she hates white people is because when she was small a white man shot my uncle and it traumatized her or something, I never met him and she never talks about him.

Any chance she'd changed now?