This is what it looks like when someone is caught in their own reality bubble.
But there's no point acting offended or put off about it. Americans certainly aren't the first or last to do it. But it's certainly done with gusto.
Americans, on the other hand, look nothing like each other. So it's striking for an American to go to another country and see people who all look very similar to each other, because we don't see that at home.