Fantasy

Eh, I put it in the same category as spaceships with ashtrays, or spacefaring humanity still building giant 1960s-style batch-oriented mainframe computers even though they've reached distant solar systems. It's something you have to be able to ignore to enjoy the older works.

(It's also better than James White's solution of calling anyone who wasn't a gender-distinguishable member of the speakers's own species "it".)