This is a description of the Dunning-Kruger effect. While Dunning-Kruger is a popular topic around tech circles, I'm not so sure about the general population. I wish people weren't so ignorant about their own ignorance.

Edit: Adding clarity

People who have superior general knowledge have greater intellectual humility because they are more aware of their own ignorance and the complexities of the subject matter. Those who do not have superior knowledge are subject to the Dunning-Kruger effect.