I say this because it's practically always a bisexual person buying into this ~gender ideology non sense~. At least when it's a gay man or a lesbian, I KNOW they will understand me, I KNOW they won't want opposite sex organs, I don't feel so scared.

There's definitely truth to the idea that this ideology does not inherently transgress bisexuality the way it does homosexuality, and so more bisexuals are likely to be on board with it. But I do think it's kind of the "No true Scotsman" fallacy to say that no one who buys into this could ever be homosexual. I think some of them are, and are just really shamed and repressed. Remember that gay people have been known to enter straight marriages, under social pressure. There are also some genuinely gay people who would date trans people too, under enough social pressure.