I have been on Mastodon almost daily for 5 years, and I’ve got absolutely no idea how you have found “all the edgy fascists” on there. I mean sure, if your only experience is on truth.social i expect you’d see that type of content and nothing else. But besides truth.social, I don’t really know where you’d manage to dig it up. Must be hard work lol.
There is no algorithm spying on you across the web and recording your actions and behavior to try and force you to engage with an automated sub-optimal content stream, you have to manually curate your own (hopefully optimal) content stream, which you then engage with. That’s basically the difference between Mastodon and the rest of them.