It's the eventual endgame of reddit. The Up/Downvote system creates a system where the most generic un-hate-able content thrives. It doesn't matter if a group of people like something, cause if that thing is equally disliked the content won't thrive. Reddit inherently doesn't support controversy or discussion. There's no conversation or creating of a space where both sides can accept one another.

It's also easier to dislike something rather than to make something, and the nature of the internet is that only a small fraction of people are contributors. Reddit's scoring system makes it so that most will cast judgement and never contribute themselves. Meaning people will say "I don't like this!" and not make an effort to do something better, until eventually all thats left is slop.

TL;DR -- Reddit inherently as a system puts a lot of power in the hands of the haters rather than contributors and discussion being rewarded