The point I would make in response is that even if he is correct (and I would argue he isn't) it doesn't neccesarily invalidate the products of reason. Two plus two IS four, it doesn't really whether a caucasion male or an hispanic female was the one who postulated it.
What's happening is an attack on objective verifiable truths. For some of these whacked out environments, the priorities are interactions and self esteem and acceptance of feelings.
As a retired math teacher, I believe in a body of knowledge that starts from a few basic understandable premises and then follows logically from them. It's gotten a little better in that it's gone back to kids are learning their basic facts again. But for knowledge as a whole, we're getting away from a commonly accepted body of knowledge that's where we all start in agreement.
So I worry if rational thought becomes a white man's bias. What we're ending up with is a culture that is not the one we're used to. People are swayed by emotion and group behavior. They don't have a filter that considers fact or rational conclusions.