Stereotype that all Americans are generally dumb and don't know anything about the rest of the world, which i now viciously try to guard against!. I genuinely didn't realize it was embarrassing or offensive to not know where every country/city was (but now I can completely understand).

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When I met somebody who was from the Netherlands when I was 18 I made the mistake of asking if that was next to Sweden..... which it is not. Ha. I cringe just typing this at how embarrassing this was... but at the time I didn't realize that would be offensive. That opened me up to a host of "typical dumb Americans, doesn't know anything about the rest of the world!" Now I am super careful to be as well versed as possible.