"The more we isolate ourselves from new people, the more isolated and segregated our society is likely to become."

So this is the only sentence approaching a real argument in the article. And it's not entirely unreasonable, but the author goes straight to words like "antisocial", "rude", "self-indulgent", and "selfish" to describe the act of skipping large gatherings.

I'm just not entirely convinced that introverts are likely to cause the downfall of civilization. Even in the pathological cases of truly isolated individuals, they're really only harming themselves.