yeah, people are like that. I've over heard conversations on the street, conversations at work, etc, etc. And some people mentioned it to me (not knowing my trans history). Previously, I've only occasionally ran into someone, or talked to someone at work who brought the trans issue up. Like, for example, one girl who used to work at my work was complaining about people transitioning and how they aren't really women and have no idea, blah, blah, blah -- oh, and that she could spot trans people really easily (lol). Of course, she didn't know who she was talking to, but that's how thick some people can be at times.
As for friends, I generally don't hang around people that think that way.
--natalie