I don’t really have a clue how I’d react if I was attracted to somebody and later found out they were a dude back in the day. But I can see just that fact making people feel uncomfortable and now unattatracted to them and I think it’s fine. Some people aren’t so comfortable with their own sexuality that they could gloss over it, them as a man may be an image you can’t get out of your head etc etc. People lose attraction to people for all sorts of reasons, some legit, some petty and judgey as fuck but it doesn’t matter. Your right to be attracted to whoever the fuck you want isn’t something anybody else can interfere with