I think that it’ll get better over time, for structural reasons: since Reddit is a big instance with lots of users and only a few admins, the admins give no fucks on how you behave there. (And if you’re banned by a mod, you create another username and problem solved.) Here however individual users are more precious for their instances’ admins, so admins have more reasons to keep their instances clean of people likely to piss off other people. And, even if they don’t, I predict that instances with notoriously rude individuals will get defederated. The net result is that those users will have low visibility for other users.
What concerns me the most is not combative, trolling, and unnecessary rude users. It’s the stupid - users who are able to reason but actively avoid it. It’s the context illiterates, the assumers, the false dichotomisers, the “I dun unrurrstand” [with either an implicit “I demand to be spoonfed as per my divine right”, or an “I disagree but I’d rather pretend that I’m a stupid than outright say it”] and the likes. People tend to pat those users on their heads and talk about esoteric stuff like “intentions”, but I don’t think that they should be socially accepted here, as they drive the dialogue level down and make the place less fun for other users.