Ehh I’d suggest feeling it out for yourself to be honest. I’ve had some great interactions on .ml communities, as well as .world communities. But also some hair-pulling insanity. That’s where some of the most active conversations happen, but that also means you’re more likely to encounter some trolls and some awful petulant fools. When you do, just unsubscribe from the community or block the user and you’re all set.
Self-curation is one of my favorite things about Lemmy, and it’s why I like .ee as an instance, because it’s quite neutral and they let individual users choose what communities we want to see and don’t force decisions down our throats. The beauty of this place is that you can always switch instances or block communities and users you dislike, you just have to spend some time curating your experience.
It’s a pattern of behavior. If a user spends their time nitpicking every minor detail of a comment, but seems to be incapable of understanding that other people have different ideas, or worse purposefully parses someone’s language incorrectly just to continue an argument back and forth without any progress or even a desire to see a resolution, only wanting to have the last word, I consider that to be trolling. Nobody has benefited from the interaction, and everybody leaves frustrated, annoyed, and only further entrenched in their original position.
I think people have pretty different ideas of what behavior counts as trolling, but simply disagreeing with a user or not liking their posts doesn’t make them a troll.