The pedantry of being angry at the US for being the only country that actually has the word "America" in its name and yet calling itself American is almost comical in its ineptitude.

Nobody shakes their metaphorical fist at the Central African Republic for daring to use Central African as its demonym. It's simply understood that the surrounding countries are also African, yet simply do not have the name of the continent in its name.

But if you do want to be pedantic, England is not technically a country anymore, it's the United Kingdom.