They think giving boys and girls the colors blue and pink respectively is sexist, yet wish death upon men every day.
They cry bigotry whenever someone disagrees with them, yet wish the worst possible fate upon those who aren't exactly like them.
They claim to be inclusive, yet flip out whenever they see people taking an interest in anything outside of their own culture.
They call right-wingers racist, yet they have an irrational obsession with people's ethnicity, among other things.
They scrutinize everything even remotely off-color, and yet act like they can do no wrong themselves.
They bitch about who supposedly started an issue, yet have no interest in ending the issue.
They think all people who are white are inherently racist.
They spend their time harassing, guilt-tripping, and doxing people online because they think that's what social justice is.
They think they're helping, but they're too far up their own asses to look at themselves and realize that they're actually doing a disservice.
I'm talking about the notorious social justice warriors. And just what are they? Well, take one of those history books about the Civil Rights movement that has a lot of dramatic and iconic pictures of riots and protesters, add a naive kid who thinks it would be fun to get sprayed with a fire hose and be hailed a hero for it, and you've got yourself a cancerous tumor.
Far-left fascists who wallow in a hyper-collective mentality and subsequently see different races, genders, sexual orientations, or religions as single giant entities instead of individual people. They have a selectively strict herd mentality where people who are X represent the complete embodiment of every negative thing that has ever happened or been done by other people who are X, past or present, even if the individual in question has wronged no one... just so long as it's convenient for them. They don't see you as Dave or Joe, they see you as White Cis Male unit № 25787429.
And it's impossible to take them seriously because you know they're only doing it either to bolster their reputations, or they're just desperate to stand out as if being a majority is inherently bad. SJWs and special snowflakes often go hand-in-hand, but there is a difference between the two. A SJW is someone who is overly defensive and flips out any time they see something that could even be remotely construed as offensive. With a manipulative demeanor that ranges anywhere from smug and passive-aggressive to bugfuck hysterical, they have this sanctimonious fantasy that they're some great revolutionary civil rights pioneer. A special snowflake is just someone who stretches to ridiculous lengths to be as far removed from any sort of norm whatsoever.
Chances are they care less about actually improving the world and more about being special martyrs.
And no, being against SJWs does not mean you're against social justice (many vocal anti-SJWs are generally left-leaning on social issues). That's like saying being against the WBC makes you anti-Christian. I'm not opposed to the raw concept of social justice. A lot of the stuff that SJWs whine about, victim blaming, dysphoria, all sorts of -isms and -phobias, patriarchies, mental disorders, toxic archetypes, even privileges, they do exist on this planet. Whether they're fringe and unusual or not. Not all triggers are invalid either, and trigger warnings can definitely make sense in certain situations, such as support groups. But the (cynical) truth is that SJWs abuse these issues in order to feel some of that good ol' special-snowflake sociopolitical hero nirvana, and in doing so, erode all seriousness away from the issues. But hey, that's all narcissists care about.
TL;DR: Tumblr is a mecca for melodramatic, unproductive virtue signaling and juvenile high-roading... it's not even exclusive to SJWs. Most people do this in some form.