Well, my neck muscles are certainly getting some exercise from shaking my head so much.

It is the Dunning-Kruger effect, where the ignorant are more confident and thus more convincing than people who actually know what they are doing.

I detested the American President George W. Bush like a cockroach found in your tasty pizza, but Trump, the poster child for Dunning-Kruger, was astonishingly worse, because he was both stupider and more confident in his stupidity.