Earlier quoted context omitted.
I disliked the part where he assumes he can tell where someone is born by looking at them. :( I wonder if he thinks he looks like a native-born or an immigrant?
Can't you? People throw off subtle cues all the time, and whether they're native born or not is something that isn't hard to pick up from that. Conversely, take a native born person of Japanese or Indian descent, and send them to Japan or India. The natives there will be able to tell he isn't native born.
A friend of mine who traveled to Central Asia was struck by how balanced people appeared; he found Westerners take up "too much space" in their movements, and East Asian people tended to do the opposite. But at least during his stay in Central Asia, he noticed the people there repeatedly showed an unconscious balance in their body language: neither too loud and aggressive, nor too quiet and subdued.