I still come here for the articles and I occasionally read the comments but I don't participate much. I feel the same way as the original poster. I see someone post something genuine and then I see someone else rip it apart in a condescending way.
I used to come to HN and on the other side of the usernames, I pictured the leaders in our field, the pioneers of the next steps of our information age, and people who I wanted to emulate.
It's not this way for me any more.