I have seen a full array of racist acts, some subtle, some overt. Many were committed by white people, but I have seen such acts committed by blacks, Asians, Hispanics, and Native Americans, as well as folks from different economic levels, different educational levels and different religions.
My daughter looks white so she has witnessed the more subtle forms of racism, such as where one little girl at school said to my daughter that she wasn’t going to invite a third girl to her birthday because she was black (her father was indeed black, her mother white). My daughter’s response was to make friends with the “uninvited” child.
My son looks black (and is a boy) so he has experienced the more overt acts such as name-calling. He also has been left out of various play groups (by the “witch” across the street in particular) and overnight activities (my ex-SIL refuses to let him spend the night at her house, so I won’t let my daughter spend the night there either).
I have listened to my Japanese/Korean/Hawiian nephews talk about white people in a denigrating fashion, and some of their relatives talking about “gaijin” and then quickly going quiet when they realize I am in the room. And on, and on, and on.
People are smart enough to attempt to overcome their innate need to divide the fellow members of their species into us versus them, but it will take a lot of work. That drive evolved over many, many generations as a way to protect your own kin from outsiders so we are very skilled at recognizing differences and classifying those with those differences as being “them” or “those people.”
We have overcome some prejudices in the past – for example in much of America it is no longer a huge demerit to be Irish, where once it was a major flaw in an individual. We have made strides by enacting and to some degree enforcing legislation that makes it illegal to prevent others from prospering simply because they are different.
We can only hope that we will continue to shed these categorization tendencies as we see that they really don’t help our society as a whole.