If you go sifting thru sci-fi writers(or writers in general)for bigots or other questionable ‪ traits,you'll end up with a pretty poor pool of books.
Orson Scott is an asshole and it comes thru in his books but that doesn't make ender's game any less of a classic(though some of the later books are infuriating).
What's hilarious to me is that for the most part we don't exist in the future or at best we are so mixed that race is not a problem.
I'm just glad these attitudes did not affect me as a young reader or warp my sense of self.