I agree. Or perhaps even better than 'mathematically incontradictable' racism (but not quite as good as no racism) is having a more sort of standardised racism.

I heard from a Chinese friend of mine that some Chinese universities wanted to increase attendance from non-Han ethnic minorities. They did this by giving them +3% on the entrance exam.

This makes it clear racial discrimination, but on a fair and standard basis. Nobody is going to pass the exam just relying on that 3%. But the university gets more minorities accepted than they would otherwise too.