She didn't say she doesn't like bisexual people she just said she couldn't date someone who likes both. I have the same mentality. I rather just date a man who is gay than bisexual. I don't have time for the games of you not knowing what in the hell you want.
A lot of my lesbian friends who date bi girls usually get annoyed because the bi girl will usually still keep going back to guys more, and most bisexual guys I know mess with men more because gay men are usually easier and less complicated to have sex with. IDK...it is what it is.
I don't know if I would call it biphobic. I can understand where she's coming from but calling it "deceptive" was such a bad word choice. For me though, it doesn't matter if you're gay or bi, because if you're gonna cheat on me with a woman, then you probably would with a man too, so it doesn't matter either way.