I can’t say I never downvote anyone but I get into these comment chains from time to time where really no matter what I post whoever I’m talking to downvotes every response but I generally shy away from downvoting even things I dislike. I don’t want to fall into an echo chamber where all I see are only the things I agree with.
I just down vote when I see low quality content or irrelevant or poorly supported arguments. I have upvoted takes I disagree with and then commented about why I disagree. It’s not supposed to be a disagree button, it’s supposed to be a “move this down in the feed” button.