Yeah, now that I think about it, the overton window even in 2015 was basically the same as in the previous two decades, SJWs just occupying a space nobody was even close to in the first place.2016 gave us some pretty nasty whiplash with how extreme the left was getting. There are lots of stories out there about people losing friends, and family members cutting off all contact with anyone who wouldn't get irrationally angry at Trump, no matter what. And it was so widespread, too.
Nowadays I claim I disavowed leftism right when Gamergate happened, but in reality my moderate-left beliefs were pretty rock-solid up until 2016; until then I even believed there was some genuine systemic racism, but still thought SJWs were completely retarded because of how extreme they were. And no, I was in 4chan/trolling circles by then. Hell, it was only last year when I finally openly embraced the republican party as opposed to seeing them as the lesser of two evils.
In 2015-16, some actually good memers made pro-Bernie memes, and it felt that the de facto stance was that having to choose between Hillary and Trump was a disaster in and of itself, Trump just being the lesser of two evils instead of a legitimately good president. God-Emperor memes felt more ironic and just anti-establishment at the time, but nowadays anything less than glowing praise gets branded as TDS. Even in 2017 IIRC, not having sex with trannies being "transphobia" was just a YouTube video by some retarded transtrender with a massive Adam's Apple, not a thing actual organizations made PSAs and people got arrested over.
But it's completely the left's fault that this happened, the Ferguson versus Floyd riots being the perfect example. Using school shootings as an analogy, sane people agree that while they're completely fucked and not justified in the slightest, the perpetrators were usually undeservedly bullied and/or didn't get the help from adults they desperately needed; Columbiners, on the other hand, actually think school shootings are awesome and that the victims totally deserved it. The prevailing leftist opinion in 2015 was akin to a sane person's view of school shootings, but now anything less than full-on Columbiner is considered white nationalist rhetoric. Nowadays the term "SJW" is barely used because "leftist" means practically the same thing.
Heh, I grew up in a leftist suburb and started high school during Gamergate and graduated in the aftermath of Parkland, which happened to perfectly encapsule the period when SJWs subsumed the left. Freshman year was basically the same as when I started kindergarten in '05, but the assemblies and views my teachers espoused grew insaner by the year, to the point where every class in senior year asked for our pronouns on the first day and I had to write an essay on how Hillary lost because of the patriarchy.