One thing we try to discourage on HN is "me too" or "disagree" posts that don't have much more content. The presence of upvote and downvote buttons means that those comments don't get made, because votes serve that purpose instead.
There's still room to start a discussion if you have a specific point to make (and the desire to make it) about the problems with someone's comments. Those discussions do tend to happen when someone makes a disagreeable but thoughtful point. But sometimes it's just better to throw a downvote at an obviously wrong (or stupid or offensive or mean) comment and move on.
There's still room to start a discussion if you have a specific point to make (and the desire to make it) about the problems with someone's comments. Those discussions do tend to happen when someone makes a disagreeable but thoughtful point. But sometimes it's just better to throw a downvote at an obviously wrong (or stupid or offensive or mean) comment and move on.