Speaking as an American who has lived in other countries, the idea of "American Exceptionalism" is rampant in the USA and you will not undo it with any appeal or facts. It's built into the identity of so many people here. Seeing that as a group Americans are a majority on most English speaking websites, criticism, however correct, is always met with egoistic backlash. I hope you haven't taken it personally, nor believe that it's ALL of us. Nationalism is a disease, but one not likely to be cured.