I'm registered on a mastodon instance and I find it quite nice and not at all a dumpster fire.

If you're a conservative or so you will probably have a hard time finding an instace you feel at home at, but the defederation of mastodon instances from instances that allow hate speech, racism, homophobia, etc. are precisely what prevents it from being a dumpster fire.

The Fediverse is not without issues but I think it is an example of fuctioning decentralized social media.