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 agree with this. If I’m scrolling through a Linux forum and someone is stating something demonstrably incorrect, I don’t want someone to stumble on the post and run into difficulties so I always downvote that particular post and upvote the posts with the right answer.
Now, if I disagree with someone that’s different.
Like if I’m in a thread about your favourite tv show, I don’t downvote someone I disagree with because it’s subjective. I might upvote the people I agree with, but it doesn’t seem fair to downvote someone’s opinion.
But some things are either right or wrong, and your example of bad technical advice is one such thing