Speaking of the national stereotypes and loudness, just put together more than 2 Italian tourists and they're guaranteed to be the loudest in the room, they're just unbeatable... but they do it with a lot of charm, I have to admit...
There are cultures in the world that are more obnoxious and more "impolite" than American in my humble opinion (and I'm not implying anything about Italian culture here). However, I think the distinction of noise in America is that it's a cheap way to make people excited, and it wears people out over time.
