While not exactly about treatment of others, IQ, which is easier to measure, varies among races. Clear variance can be seen, but even then it is not PC to be aware of it.
In short, it is PC to go against science. And this is a growing trend, as evidenced by the new shutdownscience meme discussed here f.ex.:
This reply says absolutely nothing of substance about what I said. I suppose that is because you don't really have anything to say, except that your feelings were hurt.
This is what losing an argument looks like. Replying to a claim that he has nothing to say by saying nothing once more, except empty generic non sequitur insults and expletives.
He can go on and on forever with pretend arguments and attempts at framing the debate like this, but there will never be any wisdom to be found here, as it is just battle tactics
I suppose I have clarified sufficiently many times now how this guy is totally dishonest in his discourse (framing/lying), and it should be understandable if I stop here.