I think what Chanyeol did isn't cool, he SHOULD becareful with how he jokes about things like skin color/tones because stuff like that just isn't funny. Maybe at first it is but if you constantly do it then the person might feel bad and Kai has proved to feel bad whenever Chanyeol makes jokes like that, I can see his expressions that he just doesn't like it. Sure he might laugh it off but we all wear masks after all: Maybe it hurts him on the inside.

I truly don't know if Chanyeol's nesessarily a 'racist' but he should be aware of what he's doing and how it could affect other people.