One of the things I was really struck by was how frequently some of these children used the phrase That’s racist or You’re racist. They were using this word in contexts that had nothing to do with race: They were playing chess, and they would talk about what color chess pieces they wanted to have, and then one of them would say, “Oh, that’s racist”-so things that had to do with colors, but also sometimes just out of the blue, instead of saying, “That’s stupid.” These kids have taken this phrase, That’s racist, and inverted it in a way such that it’s become meaningless.

Source: How to Teach White Kids About Race – The Atlantic