Bi People can be homophobic. I know a gay guy who “hates poofs” oddly, but what he means is he hates overly camp people.
It’s also completely possible to be a minority racist.
My SIL claimed for many years not to be gay, despite being in a long term relationship with a woman, she’s wasn’t gay, she just loved one women, she’s wasn’t Bi because she didn’t fancy men, although she dated a few before the woman, she didn’t fancy other women other than the one she was with. I think a lot of that was guilt from her catholic upbringing, she’s gay now and married.