It is describing the presented public image of r/WSB. The next paragraph makes it clear that this is intended by r/WSB to be humor. I personally don't think that an article reporting on offensive humor should itself be flagkilled.
That is how r/wallstreetbets users refer to themselves.
You probably shouldn't go to r/wallstreetbets, people there call each other that among many other slurs.
"I also don't agree with the Wallstreetbets culture. I'm just trying to explain it."
You can explain it without calling people "autistic losers".
Just "losers" is sufficient.
It's not sufficient, because the culture of WSB is such that they refer to themselves as autists. To not use the term would be an inaccurate description
You don't have to use the same language as the people you're talking about.
See, for example, ThoughtSlime's coverage of fascist militias.
Or we can stop bending over backwards to try to satisfy everyone's delicate sensibilities
You don't get it, so here goes: they refer to themselves as autistic losers, and "retards" and such, precisely because it "triggers" someone exactly like you. You won't look any deeper, having been "triggered," and that's mission accomplished for them.