I saw an episode of Faulty Towers once, where a stereotypical American comes to the Inn- he is loud, obnoxious, and asks for things that they don't have.
Tonight, one of these stereotypically loud and obnoxious Americans was having dinner in the same restaurant as us. He was from Texas- I could tell by his accent. He was wearing cowboy boots, was tall, overweight, drunk, and his voice was about twice as loud as it needed to be. To top it off, he was talking loudly about money, and how inexpensive everything is. Not so endearing, I'm sure, to the other people in the restaurant who have suffered through the economic collapse.
He also callously called the delivery boy over and asked him to box things up at the end of the meal. First, the delivery boy doesn't speak English (yes, he asked in English), and second, it's not his job.
Everyone else in the restaurant was subtly rolling their eyes and was relieved when he left.
A local asked Rob in a bar a couple of months ago, "Why are Americans so loud?" I was surprised by this at the time, because I thought the stereotype was outdated and relegated to European sit-coms.
Now I realize it's not. *Sigh*