I think most people who say that are denying the existence of what is sometimes called “reverse racism“. i.e. prejudice against white people by black people. I think there’s some truth to that denial, as there is a tremendous moral difference between anti-black racism and the justifiable instinctive suspicion that many black people have of white people. But I don’t think that difference is accurately covered by just saying “reverse racism isn’t a thing“. I’ve been working on an article on that for a while. it should be out on Medium fairly soon.