Gab Dissenter is essentially Reddit, but for Nazis: you can start threads around anything or based on links (“a comment section for the internet”, as the nazi-supported company calls it). And it’s really shitty: no moderation.
even Voat (the reddit clone for racists) had some level of “moderation”.
Where everything becomes so awful that everyone else runs away, where everything is exhaustively trolled, Nazis is who’s left over. The exhausting troll pit is their natural environment. There is no equivalent on the left. The goal on the left is not to be as horrible as possible.
It’s absolutely a thing, as in, protesters who are anti-fascism and go to Nazi/white-supremacy rallies to counter-protest. The alt-right have fashioned an image of antifa as the ultimate left-wing evil who go to their nice lovely peaceful alt-right picnics to murder people (whereas the opposite is literally the truth).