A couple of things here. I run into white racists here and there. Recently, there was one on Reddit. He said that black people are more violent and less intelligent than white people. I told him a couple of things. I said that, first, Europeans were more violent because they violently took over the world back in the colonial era. Second, I told him that the only true Homo Sapiens are Africans because Europeans bred with Neanderthals which had lower IQs than Homo Sapiens. Do I really think that one group of humans is anymore intelligent than any other group? Not at all but I like to mess the racists who think so. They need to realize that they aren't any more important than the people who they try to keep down. That is the point that really needs to be made.

You mentioned ear shape. That's funny to me. I always say that if the aliens came here they would say "Can you believe these humans? They care about skin color instead ear size." because they would have their own prejudices. Unfortunately, that seems to be the way. Even people of the same ethnicities find some reason to hate the others. I have never been able to figure out why people are this way.