That would just be misinformation
Sure, according to us. But you don't actually need to be right to think you're right. If someone believes the earth is flat, they'll downvote "globe-talk" as misinformation, just as it was intended! So it all just comes back to (dis)agreeing.
I know and I chose those two examples to illustrate that people will even disagree with stuff that is blatantly factual. So it just gets worse if you enter murkier territory, like politics or ethics where there is no firm factual basis.
I'm sure you won't have to search too long for a very well written post by some tanky about how a North Korean style dictatorship is superior to western democracy. Should you upvote it just because it's well written, even if you think the idology is insane and dangerous?