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.
Personally I don’t see much point in voting either way in a thread like that. You’re using the vote button to express disagreement but you don’t have anything to say or contribute.