Sowell has the advantage of being black, which makes his view closer to home than the vast majority of anti-racism activists, who seem to frequently be white people telling other white people what black people find offensive (see: comments on the GitHub master/main discussions).
Sowell also ends up on the receiving end of genuine racism, at least according to his own claims, in particular racism of the form "why are you conservative and telling black people to solve your own problems when you're black?", as if being black actually requires him to be on the left, or makes him some sort of race traitor if he isn't.