I like how you're talking about mods being arrogant little fucks when you're acting like one yourself.
In any case, I'm fully aware of everything you've described, but I also think that you're overgeneralizing. I'm not blaming you because I know these soykafholes are the majority but believe it or not, not every board is moderated by angsty teenagers or attention-seeking whores. Good forums are niche but they definitely exist.
I used to be on a forum which was about arcade boards and stuff. It died a while ago because the majority of members naturally went on with their lives. It was online between 2002 and 2016 and I was there 10 years or so. I don't say there wasn't any drama in these 10 years, there definitely was like any community, but overall I had a very good experience and while there was of course some heated arguments, I don't recall a time when the mods acted in a holier-than-thou manner with a member. Maybe because the community, both members and mods, was mature enough to have something else better to do than to show off on an Internet website.
What I want to say is that tyrant mods and soykafty communities are not necessarily inherent to forums only. Maybe some attributes like post count made these people more prevalent on forums than anywhere else. But I also know that my experience with that arcade forum wouldn't have been the same if it was an IRC channel, or a subreddit or whatever, because of how different they are designed compared to these. Every section has its clear purpose and threads are easily searchable, unlike a subreddit. Like I said, a good forum with a good community is rare and if I was searching for a forum just to show off my leet posting skillz or to have a dope title under my username, I wouldn't have posted here and would have probably gone to Resetera or some rathole like that.