I think there's a lot of truth to this essay. As am American, I've certainly been guilty of these kinds of generalizations. To Americans (colloquially meaning U.S. citizens here), I think the phenomenon can be attributed mainly to two causes. The first is that Americans don't travel much, only a small minority hold passports. And who can travel with a meagre two contiguous weeks of holiday per year, and with real inc…
Now I know hundreds of people from other countries, and there's very little generalizing going on in either direction. But this is mostly people in their 20s and 30s, not people who grew up without a direct link to the world.