I always see people saying this and I have to wonder what subreddits they're subscribed to. My experience is basically fine, sure there's some shitty discussions or a few hostile idiots lurking about, but it's no worse than message boards generally, and most conversations seem rather good.
Part of me wonders whether some posters are just extraordinarily sensitive, and intentionally dive into the most downvoted top level comments so they can get their daily dose of outrage at the things trollS say.
I know that most reddit visitors are teenagers or young adults and that controversal topics get more clicks etc. etc. That's what people want to see? It's so...how should I say it?...sad.
Just look at r/all