The reason this is a pet peeve of mine is I often see people complaining about "the HN moderators" (e.g. "the HN mods are on a power trip and keep flagging my submissions!" or some such), where they are clearly taking this conceptual model from Reddit, and they seem to think there is a shadowy cabal of "mods" who control what gets downvoted/flagged (and, in fairness, this does and can happen in subreddits). In other words, when you see your submissions being flagged or comments being downvoted or flagged, 99.9% of the time it's not "the HN mods" who are downvoting you. It's just other, normal HN users (who have earned 501+ karma as TFA explains) who simply don't like what you have to say.
Not saying dang never blocks users/comments, but it's exceedingly rare and I've only seen it for the most obnoxiously egregious behavior after (usually multiple) warnings.