I just don't see how orientation is relevant at all to gaming. Putting that sort of thing in your gamertag seems to serve only one of two purposes:
A: Waving your orientation in people's faces for no reason, in an attempt to make a game about your orientation, not the actual game.
B: As an insult to people with any given orientation.
Hit And Run Poster Extraordinaire
--Too Dumb to Quit--