I have yet to meet an American who didn't stereotype the rest of the world and at the same time was ok with everyone stereotyping America.
I have yet to meet ANYONE who doesn't stereotype at least a little. It's your natural reaction to fill in the details you don't know. It's a natural attempt to rationalize differences in culture. It's the product of ignorance, and sometimes fear. But everyone is ignorant. It's impossible to know everything about everyone, so you are forced to make generalizations.