I don't think "social critiques" is what he was referring to. I think it was more the practice of using "racist" to define anyone who believes we should be enforcing a national border, or "bigot" to define anyone who thinks a person born with a penis is a male, or similar terms for anyone who believes college admissions should not use race as a factor, or practices a religion that does not approve of homosexuality, or any of the other madness that has suddenly become part and parcel of the left side of the American political spectrum.