Ok but just to be clear here, are we talking about people who id as bi or don't?

I am talking about people who ID as bisexual. I agree that the distinctions between people who ID as bi on AGB vs AL are important. But I'm still skeptical as to whether many of the ones who ID as bisexual on AGB are actually bisexual men and not bisexual-ID'ing AAP women (transmen).

That said-- the issue of bisexual men who do not mention that they're bisexual, as OP described, still stands. I am inclined to assume that most of them don't realize the harm they may be doing by NOT specifying, "By the way, I like p*ssy because I'm bisexual, not gay," and that it might be fruitful to open a conversation with them. Perhaps that assumption's mistaken, but I'd be curious to hear why, if so.