Why does everyone think Americans are so stupid?
Well to be honest they don't do themselves any favours.
I suggest you take a look at this video, and I am sure that this is a minority but these people don't set a good picture of America to the rest of the world.
I am pretty sure you would get similar answers if you asked elsewhere but not know a country that begins with U when the country you have lived in all your life is just p4th3t1c.
And just when you can't think it gets any worse....Link.