It's like in my mind... we all start out in one box as human beings with our very existence in common. We have hundreds of thousands of brothers and sisters just like us, we are all the same because we are human and there are strength in numbers.
The more you separate everyone by race, and then sex and then gender... the less united we become. The more opportunity for hate, for discrimination, etc. etc.
Society has already forced us to block ourselves off and treat each other differently, why would you want to make it WORSE?
After all the fucking names, terminology and things that supposedly make you 'different' you just end up alone and constantly at odds with what feels like a 'majority'. You victimize YOURSELF by doing this and allowing others to do it to you.
News flash, everyone single person is different therefore everyone is the same and who the fuck cares. Also don't argue not being human, you are in a human body so you have that in common too.