I Do Not Understand Racist People

My mom is getting racist, as she ages.

When I was a kid, she taught my brother and me to never judge a person by their race or nationality, to treat others as we want to be treated. But now?

All she does is complain about "Mexicans". Her racism seems focused on Hispanics, I guess because recently more and more Hispanic people have moved into her neighborhood lately. Yesterday she said she could hear their "loud thumping music" from next door, and she called it "disgusting". Then a week ago, we were talking about the city we are both moving to later this year, and she asked me "Are there a lot of Mexicans there?"

I'm so tired of hearing these comments, but I also don't want to argue with her all the time. I try to just ignore her comments and change the subject, but it bothers me that she has started thinking this way. :(