> When you argue with someone, you think you’re debating an idea. Often you’re not. You’re challenging their sense of self.

This seems more true for the author than everyone else.

They didn't discover anything new about others, nor did they learn to argue more effectively. They just discovered their own ego, finally realized how often it gets in the way, and gave up.

While I agree that the best course of action is often to "do nothing", sulking is not nothing. I'm convinced they're the type of person who still argues with people on reddit all the time, but decided to stop doing that at work and with family. That's still unhealthy.