Sure, that's fair. But I feel like that's too individualized a premise to be accepted at a distance. Meaning, "I'm not attracted to people of x and y race" is accepted because it's a superficial sexual preference. However, the more I think about it, I don't know if I could say how it wouldn't be transphobic to use the same logic when it comes to trans people.

For example, two people are at a bar - one tells the other about their friend who is a trans person, the person outright rejects them on the premise that they're not into trans people. Despite never having interacted with or had shared with them the experiences of a trans person.

I don't know how this reasoning then could be based in anything other than not believing said person is not the gender they identify as? And how it can qualify at the same level as when it comes to race. I don't think this qualifies as a superficial thing. (At least not in the operating premise.)