Up = Like it, interesting novel take (even if I disagree), funny and clever
No vote with comment = disagree but worthwhile discussing, unintentional but incorrect and/or misleading info.
Down = Spam, low effort to the point it’s insulting (clearly not reading beyond the title), flaming and flamebaiting (this is a big one on forums like this everywhere), trolling, intentionally incorrect or misleading information, off-topic/irrelevant stuff.
Report = hate speech, violence against members of our communities, incessant trolling or flaming or flamebaiting (more than twice in a row).