Man it doesn't even need to devolve into a debate. You get berated just for having an opinion on something more and more. That's the problem with the voting system anyways. People that don't share an opinion with you shouldn't even have an option to down vote. Just don't vote at all. Up votes are for shared opinions. But even then the biggest gripe I had with reddit was the system has the up voted "popular" comments as the most viewed as well, leaving the opinions of people unseen without looking for them.

People are impressionable. If they see everyone agreeing with a comment they feel they need to skew their opinion towards the common dissent or risk being alienated. We're communal creatures. And social media screwed with our heads with the need to fit in.