Using the Merriam-Webster definition of racism,

racism
1 : a belief that race is the primary determinant of human traits and capacities and that racial differences produce an inherent superiority of a particular race

You CAN be racist against white people but is it OK?
Is it OK to tell an entire race they need to atone for the actions of their ancestors?
Is it OK to tell an entire race they are racist simply because of their race?
Is it OK to blame an entire race on the actions of 2 people?
Is it OK to purposely tell your kids to not trust an entire race?

Sadly I doubt I'll get many honest answers because it's not PC to you think racism is OK as long as those your racist against are white. But hope springs eternal.