Who would say:

There is no worse ignorant than the ignorant who is confident in his right:
"Friend burned: "Let’s go to the United States? I want to see London" Good knowledge in Political Economy."
Wikipedia does not hide that in addition to the capital of England:
London is a city in Ontario, Canada.
London is a city in the state of California, USA.
London is a city in the state of Kentucky, USA.
London is a city in the state of Ohio, USA.
London is a city in the state of Texas, USA.

You confuse two terms: ignorant - the one who is not polite, and ignorant - the one who does not know.