I think I’ve settled on the latter. Disagreement is maybe best communicated by the absence of an upvote? And downvotes work best when they signal something that is just off base, and while not reportable, is not appreciated at a broad cultural level.
I think voting based on quality of content (and NOT whether you agree with it) is the best approach for healthy discussions. If somebody is a low effort troll, then for sure downvote (and maybe even consider reporting).
OTOH, if somebody makes a well written and thoughtful post about why Totoro is the best Ghibli movie ever, and meanwhile you think Totoro is not even in their top 3, then I would still recommend NOT downvoting 😃
The only times I’ve really been downvoting is if someone is giving out completely incorrect information, like in a support thread or something, and confusing matters. It’s not a personal judgement or anything, just trying to keep things clear for the person asking the question.
If I disagree with a comment, well no biggie. Sometimes it’s worth discussing like adults and sometimes it’s just a subjective opinion. If it’s offensive, I’ll report it and block the user.