Human sexuality is itself prejudiced.

Correct, people have their prejudices when it comes to partners. I think I'm starting to get the disconnect now. The comment I replied to stated that lack of attraction to trans people isn't transphobic. I think people are reading transphobic in this sense as explicitly hateful, and I've been trying to state that while it might not be hateful, it is transphobic in the sense that it's displaying a prejudice against trans people. Perhaps a misinterpretation of the term on my part, but I question if someone's prejudice towards a trans partner stems from a level of internalized hate, conscious or not.

You are claiming that sexual attraction is never allowed to stop once it starts.

No I'm not, and if that's really how it's been coming across, then that's a mistake on how I've been phrasing my argument.

The dealbreaker is absolutely allowed to be genitalia - it can also be a mole or an odor or a nose that you decide reminds you too much of someone who caused trauma or whatever.

I've been saying this over and over and I don't know how else I can phrase it to make it clear that I don't disagree with that idea. You're allowed to have whatever deal breakers you want, but that deal breaker being solely that the person is trans is prejudice against trans people.

It is very much you saying we can control attraction to deny how sexuality operates.

Again, I'm not trying to say this and if that's the position that's coming across, then I made a mistake with my wording.

We can argue till the cows come home about whether or not refusing to date a trans person is okay, but I'm not trying to argue the morality of prejudice against a trans partner(though obviously I have opinions about it). You and the other person who replied to me may think that the prejudice is okay, prejudice isn't inherently negative. But the argument I'm reading from both of you is that it's somehow not prejudiced, which is simply incorrect by the definition of prejudice.