ShitRedditSays, or at least it's primordial form, can trace it's abiogenesis to a thread on the Something Awful forum which was feigning mock indignation about, back then, mocking furries. Specifically, the ones that think they have the spirit of a ten thousand year old dragon or werewolf or something -- therians and "otherkin". Most of those sorts were on Tumblr then as well. When Twilight was all the rage, you were awash in vampires as well. There's a direct lineage from that to the modern SJW tropes. I'm not comparing a guy who thinks they're a wolf to a guy who thinks they're a girl. I'm saying that a lot of the people who, acting as trolls, mockingly supported -- in the most vitriolic and radical tones of combative advocacy possible -- the "rights" of otherkin/therians (I remember one instance of a girl complaining on her LiveJournal that the band of her phone headset she had to wear at her receptionist job hurt her ears. Not her real ones, her spirit cat ears. People piled on to her defense -- for the lulz, mind you -- and harassed her employer) are the ones who graduated on to using the same tactics to "support" -- again, disingenuously, for "the lulz" and troll humor -- the trans demographics. A lot of the strife was actually manufactured to provide an antagonist for their manufactured protagonist narrative. The newbies to the "movement" didn't know that both the most extreme grievances and strife were contrived, as was that the support against the scarecrow antagonists performance. The joke took on a life of its own and escaped the laboratory. SRS... Is a Potemkin village, with well meaning but unknowing denizens.