Some people think that being "odd" (which is how it's perceived, but it really isn't) is immature or childish. Those are often also people who have never had to face that sort of prejudice in their life.

Wii experienced the same thing when wi started opening up about being mixed origin. About having a higher alter count. About having "quirky" or "silly" alters. The moment you do not fit someone's perception of that marginalized group, you are the enemy; and wi were attacked by more systems than singlets, truth be told.

Don't let it get to your head. You know who you are, and you don't need to speak to people who disagree with that. They are not you. /You/ are you.

I'm really sorry you're dealing with all that crap on Tumblr. It totally sucks when people are jerks for no reason. But seriously, don't let those losers get you down. They're probably just insecure or something.