I haven't transitioned yet but I do have a similar problem. Guys are paying me attention until they get a good look at me.. and it's effecting how I react to gay / bi guys that could potentially be good for at least a short term relationship.
For example, tonight I went out and while walking around, i've had numerous guys wink at me, call me sweetie, etc, then get close enough to me to make out that I'm male, then they turn around and run off or will look at me funny. I'm kind of worried that soon, some crazy guy will snap on me and try to hurt me!
A friend of mine said that a guy looked at me rather ugly to the point where she was offended. I have a feeling he is a great example. Thing is, I'm not even dressing female, wearing makeup, nothing!! Then later in the night, we were in a dark club. A guy came up to us and sat right next to me, looked at me, and I thought I made his face out to be that of disappointment. So I kinda assumed "crap, this guy likes girls and he clocked me, even though I'm not presenting female" .. turns out the guy is bi! I almost wrote him off and if it wasn't for him asking whether or not I was gay (apparently there's a giant tag over my head that says I am), I would've thought he'd never be interested in me because lately, all the guys realize I'm not a genetic female after first seeing me, then run away!!!