Most likely his good manners (not being sarcastic). I genuinely find Americans to be more polite and friendly than any other nationality, generally speaking.
This goes against popular opinion, I know, but it has been my experience.
This goes against popular opinion, I know, but it has been my experience.
However, I have visited the States once and was very much impressed by how approachable and friendly people are - much more so than anywhere else I have been (border control staff excepted, of course).
I know a few people who say they hate Americans but, when pressed, they usually admit not having much of a reason that's based in any sort of reality. In other words, they have never been there and haven't met that many in real life.
Indeed, just from my experience.