Is this article meant to be satire? It's strange that this guy is so passionate about being introverted. It almost seems like he's proud of it.
"Oddly, most introverts I know have a problem with much of the "my tribe is better than your tribe" stuff in our society."
Perhaps you're misinterpreting the fact that they don't feel the need to constantly please everyone, and are therefore freer with their opinions.
Introversion is the tendency to be concerned and interested with your own mental life. It's quite possible to be introverted, and still have a strong desire to please people.