I think that a lot of what we call racism is dressed up classism. If race A is poorer on average, people of race A will get treated as if they are poor--more likely to steal, more likely to break laws as they have less to lose. If race A is wealthier or the same, on average, the classism won't be intermingled in the same way with race.

Sadly, in the US, we have a terrible system where schools are locally funded, and poor people get poor schools. Under this system, socioeconomic class self-perpetuates.