That is sad indeed.
Actually, the sad thing was that there was no indication that there was any possibility of discussion. Things were that way, and that was it. It was an argument, not a discussion, and the only thing that mattered was winning. He was right, period. A quick review of his (one year old) comment history showed that every comment he made was in that vein.
Which is the problem with online discussion in general, and online discussions of wargaming specifically. That's the problem with a large segment of what you find on Youtube, Facebook, or Reddit about wargaming or specific games. People don't want to talk about their hobby, they want you to agree with their opinion on their hobby. I find it's a complete waste of time to frequent those venues anymore. It's the same type of people I keep running into at Origins.
I'm much happier sitting down every Thursday with my regular gaming opponent. We play, we discuss the game, we discuss the hobby (we are both involved as designers/developers), and we have an enjoyable time. I'd love more of a "club" environment where multiple people did the same regularly.