Personally, the main reason I dislike Twitter / Reddit / sometimes even HN, isn't the trolling or toxic posts. It's just that most of the posts are - not interesting. Like dumb memes, popular "unpopular" opinions, or "hot takes" that are the same stuff over and over.

Even on HN, post after post is: crypto sucks, advertisements suck, cancel culture sucks, Amazon making $300 billion sucks, "bring back the old internet!" And I agree with all of that (heck sometimes I repeat it myself), but I don't need to hear it over and over.