Maybe literally any of the other yellow-to-red flags about their behavior? I mean, yeah, if you only post about your own stuff, don't expect HN to treat you kindly, but that wasn't what you initially responded to. And by the way, I've seen your name enough to know that you should know that getting flagged is not a 100% guarantee of doing anything wrong, and if the comment or poster did do something wrong it might not be obvious from the comment itself. Generalizing from flags to a rule about all comments under your own post, as you seem to do here, seems wildly unsound to me.