I'd have to say, I work in retail and no one at my work knows I am a FTM. So, it's probably one of my favorite places to be. I don't look my age, so most of my co-workers call me "Boy" for fun. But I don't mind. The weirdest is when I get guests that insist on calling me "Boss" and reply with things like "Okay, Boss", "Right on, Boss". I don't really understand how the habit can be formed, maintained, and said to a young man that most people think probably shouldn't be working in the middle of a Wednesday morning when High Schoolers should be in session.
"Boyfriend" is really probably my favorite. That puts a whole new level to everything, a reality. "Sir, young man, man, dude, bro(ther)" all have come pretty common place but only "boyfriend" has that lingering affect like "Yeah, that's right boyfriend".