Beyond the obvious trolls and complete loons, I also block people who never contribute an original comment or post and only reply to other comments in order to “correct” other people or “call them out”. Their comment history makes it immediately obvious when they are this type of user.

They strike me as particularly cowardly and obnoxious, because they only want to attack / start something against, and never risk a simple original assertion of their own. Offense being the best defense, etc. They probably think of themselves as verbal judo masters.

IOW, they are basically using Lemmy as fodder for their pedantry. I’m not interested at all in engaging with this type of jackass. Unfortunately there are a lot of them on the internet. My block list is long.