Your second paragraph is just the point I am trying to make no? People can't choose who they love or are attracted (or not attracted) to.
So I am uncomfortable with the suggestion that any cis person who doesnt want to date a trans person should set up a disclaimer on their profile, with the afterthought insinuating that they shouldn't have an issue with that unless they are secretly transphobic, or trans averse as you put it.
Personally I (as a straight cis dude) am very supportive of equal rights for non straight people, and think they are a beautiful facet of mankind. I would be fully supporting most of their causes, but that doesnt mean I am suddenly attracted to, broadly speaking, not cis women. I can't change that, or make an exception for someone, that's simply not how I was wired. Would you consider that trans averse? Honest question.