Ever visit a different country and find yourself wishing the Americans you run into were less boisterous? Do you want them to tone it down when they guffaw in the subways or talk louder than everyone else in the room? Not everybody values “outgoing and friendly” as much as Americans. Sometimes the very extroversion we view as an asset in the West looks like arrogance or socially inept behavior in the East. So…it turns out it's not just the East that feels that way. A few years ago a book by introvert Susan Cain, Quiet: The Power of Introverts in a World That Can't Stop Talking, hit the stands, and people have…