There are stupid people everywhere. It doesn't matter the country as pointed out multiple times already by other posters. Obviously this county is the superpower, and superpowers don't become so because people can't answer trivia questions correctly. Which btw, some of those peoples answers were hilarious! I personaly loved the Kegistan question lol!!
I'm more worried about the individual person who basis their opinion about Americans over 1 stupid video on youtube. It's way more alarming to me that a person can hear 1 thing and take it as truth without having solid evidence supporting it.