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