I don't have anything against people of other sexualities, but I really don't see why it needs to be proclaimed to everyone. Odds are it won't improve anything. If it changes anything at all, it'll just set off more discrimination. People that really are against it will know exactly who to target their aggression at, and I have to ask this; who benefits from this?
Of course, if they want to do it, it's down to them. But I for one don't even think to take in to account a fellow gamer's sexuality when I'm playing with them. To put it simply, I don't care, and if they feel the need to 'show it off', I'll probably only dislike them for that. Not because of the sexuality, but because of them seemingly believing that everyone needs to know/gives a damn.