I think, in most cases, the anti-American stereotypes when it comes to travel are unfair. Generally speaking, we’re not any more or less obnoxious than any other travel group — we’re generally polite people, so we’re not too big of assholes abroad — unless, of course, we’re in an all-inclusive resort, in which case all bets are off.
But one stereotype I’ve come to begrudgingly accept is that Americans are the loudest talkers on the planet. I’ve been talking to friends at foreign bars, hostels, and restaurants far too many times in what I thought was a perfectly acceptable volume and then caught, out of the corner of my eye, a scowl or an eye-roll from the adjacent table. I’ll get embarrassed and then try to speak as quietly as I can for the rest of the meal. You know, until someone says something funny.