[grzm]

While it's not in the guidelines, 'pg is on record years ago saying that downvoting for disagreement is okay, given that people upvote for agreement:

https://news.ycombinator.com/item?id=117171

That said, I think many on HN do think that downvotes should be reserved for uncivil or unsubstantive comments as they don't contribute to the conversation. Some will still downvote for disagreement or for other reasons.

I think it's best not to let it bother you or worry about it because there's not much you can do about it, other than contribute as civilly, substantively, charitably, and in good faith.