The expanse is probably the best sci Fi tv show and book series out there by far and has a very diverse cast in both books and tv show. Arrival also a great sci Fi film that has black characters in it. Honestly a lot of the sci fi I read I don't really remember colour of skin being mentioned. But those two are just off the top of my head. Also Dune's fremen are meant to be middle eastern rather than European, don't the film has pushed that as much as the author made it clear?

You've alleged a serious grievance. The burden rests on you to prove yourself. That sleight of hand to shift burden to the accused is the signature of manipulative fraud.