You don't have to sleep with anyone you don't want to. But that doesn't mean you can't be a bigot for denying someone for belonging to a certain group.
Go ahead and say no black women are attractive. That's literally racist but you can definitely say it. You can say whatever you want, but don't expect people to not tell you the truth about you acting bigoted.
And I ask someone again. Would you stop being straight for being attracted to a trans woman? Or would you be gay for being attracted to a trans man?
If it is so black and white and trans women are still men in your eyes, it has to go both ways.
I'm not asking if you want to sleep with any trans people. Go ahead and sleep with whoever you want who will have you I'm just asking which one would be gay in your eyes.
By definition, engaging in a sex act with same-sex genitalia is a homosexual act. There is no ambiguity there.