.world is also the most commonly linked instance on reddit, so half the time you're just dealing with angry redditors. Generally every time I say "wow this is so disappointing to see" it's a .world post and the other half of the comments are trying to fight back against them. I think it's just the nature of online communities that they get more toxic as they grow.

You're definitely dodging more toxicity than you are positivity with blocking .world, every time I've seen just the worst comment ever it's from .world. There might be an app or way to block the comments but not the posts from an instance, since nearly all .world posts seem fine (you could ask in the app community on lemmy, they're generally super friendly). Sorry I can't give better advice. Me personally I just stick to the positive communities and only brave the .world trenches if I'm feeling up to it (and make heavy use of blocking toxic communities)