What I've noticed in the few years I've been here is that you will be downvoted for a useless comment. Whether that comment is hurtful, comedic, arrogant... if it doesn't add to the discussion, then it's kind of a useless comment and will be downvoted.
The thing with HN though is that it is rigorously moderated by users and admins to a fairly strict set of guidelines. This means that if you're posting something that doesn't align with the goals of the community, then it probably won't be liked and feel like you were shadow-banned.