The issue was never about cultural differences or history (though I would argue that different US states have quite different cultures, too) - it was purely about geographical knowledge. In that case specifically it was Europeans ragging on Americans for not being able to find smaller European countries on a map. I tried to compare being able to point to a country like Moldova as a European to being able to point to Kansas as an American and that was apparently the wrong thing to suggest, let me tell you, but the point I was trying to make is that of course Americans aren't going to be as well-versed in European geography as a European, because we simply don't need to know where those countries are regularly. Meanwhile I'd wager most Americans can point to Kansas or Colorado on a map, but I wouldn't expect Europeans to be able to.