1. The people I've met don't fall into the "nontraditional" categories they support. The gay guys I know vehemently support gay rights, but that is as old as the hills. People defending all the other gender definitions are just good-looking heteros trying to be nice.
2. So your 2 really relies on the fallacy of your 1. People can have opinions about situations that are no their own.
3. The "chanters" are the idealists. The young guys that bang hot chicks, but decry the inequality to those other guys that want to wear dresses, have big boobs, but only want to sleep with really old asian women or hampsters.
Your entire premise presupposes that those demanding equality for odd folk are only the odd folk. I do not think that is true.