I'm attempting sarcasm to highlight this misunderstanding.
And yet you only seem to be attaining repetition and internalised contradictions!
I say "I think it's transphobic to not have sex with someone purely because they're trans"
And everyone responds as though I've said "It's transphobic to ever reject a trans person for sex"
You see you might think that there is a hairs breadth difference between those two statements. But most people reading them will scratch their heads and think "Huh?"
I think it's transphobic to not have sex with someone purely because they're trans
Is is racist not to have sex with someone purely because they are black you will offer , as a comparator? And the honest answer will make everyone feel uncomfortable because skin colour, along with all sorts of other pshycial attributes, do make up a large part of why we fancy who we fancy.
And everyone responds as though I've said "It's transphobic to ever reject a trans person for sex"
Which you did. You just gave a very contradictory reason for being able to reject a trans person - cos you don't fancy them. When it it their presenting themselves as trans that is the physicality that makes them unfanciable for some.
Would I date, have sex with, marry a man who wears a skirt? Yes. Back in the 80s I dated and had sex with men who wore skirts and even dresses. They were gender bending. I married one of them. Is he trans? No. Did he ever say anything other than he was following a fashion, being a gender bending male of the 1980s? No.
Did I fancy, have sex with, the gender bending friend who did later come out as trans? No. Why not? Because he was not a straight man wearing a dress he was a mixed up man who was unhappy in himself, who wanted to be someone/something else. He remains a friend, after almost 40 years of being something I can't call him here on MN because I will get deleted and possibly banned. He is a transwoman. A male bodied person who lives his life presenting the world with femininised version of himself.
If you have a pipe, pop that in it and inhale deeply before trotting out your next trite sentence or two.