I’m a trans man and I want to know why you guys think it’s okay to approach me because “I’m an exception”?

Saturday I met up with some trans men at a gay bar and the bar tender actually hit on me but the look on his face was a surprise that I was specifically there for A trans man meet up and essentially he looked very intrigued and certainly considering and I always hear, “you’re an exception” and I want to know why you think that’s okay…