In my mind "Peak HN" or "Stereotypically HN" has always been this very distinct display of arrogant superiority while pedantically nitpicking some minor fault in OP's comment. Like, someone writes a five paragraph post, clearly an expert in some topic, and the first reply is "Ackshually, you are wrong: You said 'all' in paragraph 3, sentence 12, where you should have said 'some' because I can easily point out a counterexample. Therefore your entire five paragraph post is invalid!" I think it's a pattern all of us (or should I say most of us) have seen...