I did drop it, and you brought it back up with the comment on whether or not lesbian sex can include a penis.
If you are acting like this about a character, which the author has created and written as being a straight man, then I rather doubt you would wholeheartedly accept that a real-life Tao was straight.
Being a straight woman doesn't mean that you are attracted to all men - it's very common to reject someone because they are too old, young, ginger, short, unintelligent, big cultural differences, or for the simple reason that you don't fancy them / there's no chemistry. Absolutely everyone has the right to reject a possible romantic / sexual partner on any grounds whatsoever.
No one is asking you to fancy, much less sleep with, a trans man.
Some straight women fancy men much older than themselves; it doesn't mean you have to. Some straight women will fancy men shorter than themselves, it doesn't mean you have to. Some women will fancy the pants off a man that gives you the ick. And just because some straight women will fancy a trans man, it doesn't mean that you have to. None of the above changes your sexuality or identity.
You can define your own sexuality however you like, but in your rush to do so you are deciding that you know better than other people what their sexuality is. You do you, and let other people do themselves.