Tumblr nowadays is generally a cesspit of awfulness. 'Special-snowflakes' tend to gather together there and, excuse the expression, have a gigantic circlejerk about each other and how unique they are
This. Honestly, I wouldn't take Tumblr very seriously, a lot of people there that use sexuality and gender as personal accessories are usually impressionable teens who try to "stand out" so to speak. You just do you, and don't worry about them, they're not worth your anger or time. :)
Actually, in general Tumblr's become a pretty toxic place, at least from what I've observed. I got caught up in it's echochamber and didn't realize how extreme and horribly poisonous the majority of it's user base is till recently.