You're being downvoted by people who don't agree with you. That doesn't mean that you are wrong. According to dang this is actually encouraged. [1] [2]

I don't think it's a good practice to downvote things you don't agree with, but apparently HN's current approach is that it is (and it's always been that way).

[1] https://news.ycombinator.com/item?id=16574021

[2] https://news.ycombinator.com/item?id=16131314