I have that exact same impression. Where I live transsexuals or transgendered people are simply referred to as "transpeople", literally "people from the other side". I'm not from the other side of society, thank you very much. Not sure if it's just a condescending piece of political correctness or if there's underlying transfobia, but I don't think I'm even allowed to question it. I don't know if bigender qualifies for the LGBT community, so I guess I'd better keep my mouth shut.
The attitude seems to be that gender is mutually exclusive, going back and forth is not allowed.