There's a hypothetical phenomenon called the "asshole filter" that some have proposed. Basically, the idea is: hostile, humorless and trolling type people chase away the more pleasant people over time. The end result being, the concentration of assholes is always going up on social media and anonymous online forums, etc.
I don't think it's very scientific. How could you accurately measure such a thing. But I have felt like it was happening as various corners of the internet have grown in popularity.
One way I try to deal with it on here is I aggressively block people. Why let my energy get drained when there's any easy way to never see the jerks again.
I don't know if this tactic will work long term. There are potentially friendlier instances to migrate to, also. Lemmy is an interesting ongoing experiment.
Hope you hang in. Completely understand if you don't want to.