“I still call people bitches. Is that sexist? Particularly if they’re male?”
Of course it is sexist. By calling men “bitches” you are appropriating an insult generally reserved for women.
I have been receiving feminist training you see. I am studying the Jessica Valenti method in how to turn absolutely anything into sexism against women.
Bet you didn’t know that ice-bergs are sexist too, not to mention air-conditioning, Santa Claus and bicycles!