The Dunning-Kruger effect occurs when a person’s lack of knowledge and skill in a certain area causes them to overestimate their own competence. By contrast, this effect also drives those who excel in a given area to think the task is simple for everyone, leading them to underestimate their abilities. https://thedecisionlab.com/biases/dunning-kruger-effect
and no doubt was not realizing he was projecting again.
It was Plato who said, “He, O men, is the wisest, who like Socrates, knows that his wisdom is in truth worth nothing”