There’s a crucial difference between bisexuals and trans people here, though.

In order to date trans people, you must cater to their delusion, by pretending that you can’t perceive what sex they are. This is understandably a deal-breaker for pretty much everyone (“trans” people themselves included; most categorically refuse to date each other).

In order to date bisexuals... you don’t have to cater to, or pretend, anything. Because we aren’t pretending anything. Same as (non-trans) straight or gay people. So the only thing distinguishing us from straight or gay people here... is our sexual orientation. Which is, therefore, what we’re being rejected on the basis of. That straight and gay people find bisexuality/bisexuals distasteful somehow.

Well, if a bi guy refused to date gay men because he found homosexuality/homosexuals distasteful somehow... what would you call that?

To be clear, I’m not saying that, even if straight or gay people’s rejection of bisexuals is unambiguously motivated by the most virulent biphobia– “I won’t date bi people because they’re disgusting subhuman animals!!!”– it shouldn’t be treated as final; everyone gets total veto power in this area. Always. Whether I agree with their reasons or not. (And whether they even give any reasons or not; “because I don’t want to” is reason enough.) Would I like to see the no-bisexuals dating policy’s demise? Yes. But only organically, as a natural outcome of biphobia’s demise in society at large. And not because anyone is guilted (much less bullied) into it.