Why do British people think Americans are stupid?

99ChickenNuggets
My sister and I were thinking about all the jokes and hate British people give us. Like dudes what the fuck? And when you think of the average American, you think of a middle aged, fat, white man. (No offense to middle aged, fat, white men). But their are other varties of people, like Black, Hispanic, Asian, White, etc. And not everyone is as stupid as you think! Most of us even welcome you into our country.
Why do British people think Americans are stupid?
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