No social news site is going to be perfect. If it's people that are writing comments, some comments will be good and some will be bad. Read them and decide for yourself. If a comment hurts your feelings, get over it. If you like a comment, upvote it, and help other people find the best comments. Really, I kind of get tired of reading stuff like this because there is always some subtext to it. "mean-spirited" usually…
I think meanness is something you have to push back against actively. This site is not in a state of nature. There are all kinds of things I do to keep meanness at bay, and the situation would be a lot worse if I didn't. Preventing the site from declining into a swamp of meanness and stupidity (I believe the two are closely related) is something I think about constantly.
Does that imply anything regarding hateful posts in HN, or is it just a 'hey, there's a correlation here' observation?