abigrock replied to your post: "I'm sorry but I don't like Rainbow Dash with a mohawk. She's daring, not a guy..."
I think you are overreacting a bit. Yes, it is your art so you draw what you want, and the poster is ignorant in regards to mohawks and sexuality, but making an entire tumblr post just to critize them is going a bit overboard.
Making a tumblr post about it is not overboard, in my opinion.
Overboard would be if I started to argue on their dA page, or write a whole dA-journal entry about it.
My tumblr is, believe it or not, my personal tumblr. If I need to vent, then I'll vent in this blog. And considering the amount of comments like the one mentioned I've recieved (because trust me, that is not the only one) I gotta snap at one moment or another. I just wanted to state that I've had enough of this attitude from the fanbase.