I suspect it predates Reddit culture by at least a few hundred thousand years. People don’t like bitching. I mean… we love bitching, we just don’t want to hear others do it.
I mean, going off the community description, it's neither "open ended" nor particularly "thought provoking", so I think downvotes are perfectly warranted.
ETA: the "you know, where dissenters get downvoted" also seems pretty bait-y because it presumes that downvotes indicate dissent rather than indicating a lack of value to the community/discussion.