I guess when Moore says that "Americans are the stupidest people on the planet" he was referring to himself.
No, when he says "Americans are the stupidest people on the planet" what he means is no one has called him on the asinine "statement" in his movie's TV ad which says:
Fahrenheit: The temperature at which air is ignited
or something like that. Fahrenheit is not a point of temperature, nor does air "ignite". Moore and the people who work for him are just as ham fisted about science and literature as they are at political propaganda.