This is probably the best way to prove his point for the record.
Plenty of folks on HN know i'm happy to participate, even in contentious topics.
I can get that kind of 'discussion' on Reddit. (IE Where the response would be someone pointing out that claiming someone else is posturing is itself posturing, etc).
Meanwhile, i'll stick to HN discussions with people who assume good faith and actually want to talk about the topic. When that stops being a possibility, i'll delete my account and go do something else with the time.