I didn't (and can't) downvote you, but if I had to guess it's because your comment didn't add much content, but has a very negative tone. HN likes to see commen

I didn't (and can't) downvote you, but if I had to guess it's because your comment didn't add much content, but has a very negative tone. HN likes to see commenters being constructive, not just correcting. (And keep in mind that things you write on the internet generally read as more argumentative than you intend them.)