I agree and disagree with your comment. On one hand the tribalism in the article is a distraction from the argument he is making. On the other hand, it's pretty funny if you're an introvert. The following quote in particular, I think, was meant to be funny: "I suppose this common misconception has to do with our being more intelligent, more reflective, more independent, more level-headed, more refined, and more sensitive than extroverts," and not mean or serious. Looked at this way the "tribalism" in the piece is pretty harmless.