I'm US citizen living in Canada. Americans are usually so programmed with Exceptionalism that it takes months for the brightest expats to clear the brainwashing. I was lucky enough to have very patient friends who politely explained why my "America is obviously better" was wrong.

Americans rarely pay attention to all the USA flags in all their television programming, so you must forgive them for the militant nationalism. They really don't know any better until they've lived outside their borders.