If what he says is true it wasn’t about race per sa but about vigilantism.
If the man who raped his friend (and I suspect it was someone closer as he goes on to say come home from work and asks how they are) was black you would ‘go after’ black men, if he had been Chinese , then go after chines man, if white go after white men. It has nothing to do with race other than the race of the rapist.
But why mention it now? Oh that’s right he has a similar themed film coming out.