Okay so @Big_Boss_77@lemmynsfw.com there just hypothesized they're fetishizing you...I'm going to hypothesize it's the opposite, they're just barely willing to give you a shot.
So, typical straight guy, downloads Tinder. Swipes right on ten or twenty thousand women. He gets one match: You. "Trans? Really? Sigh. Okay fuck it let's give her a try."
Here's a little known and widely disputed fact about straight men: they don't like having sex with people who have penises. So being asked by the trans woman you just met on Twitter "By the way, are you bi?" sounds a lot like "By the way, I have a penis, are you good with that?"
No, he's not. So he nopes out. And probably stops swiping right on trans women.