I have to say, this one strikes me as a little bit bullshit.
1. FEW PEOPLE ARE IMPRESSED BY US
Unless you’re speaking with a real estate agent or a prostitute, chances are they’re not going to be excited that you’re American. It’s not some badge of honor we get to parade around. Yes, we had Steve Jobs and Thomas Edison, but unless you actually are Steve Jobs or Thomas Edison (which is unlikely) then most people around the world are simply not going to care. There are exceptions of course. And those exceptions are called English and Australian people. Whoopdie-fucking-doo.
As Americans, we’re brought up our entire lives being taught that we’re the best, we did everything first and that the rest of the world follows our lead. Not only is this not true, but people get irritated when you bring it to their country with you. So don’t.
I have no idea where this guy's getting his information from, and I can't speak for the Brits, but I can safely say that most Australians look down their noses at Americans. Not to any American tourist's face, naturally, but the attitude is very much there. The more recent reputation they've picked up as the land of the disturbingly frequent school shootings hasn't exactly helped matters.
I'm British, but don't I look up to Americans, and most of the people I know that that have been there just think Americans are weird.
As for knowing nothing about the rest of the world, I couldn't point out Iraq on a map. Also my dad genuinely asked me once if beige was a colour in America... so ignorance goes both ways.