if someone is unintelligent and thinks what they are saying is a true statement,

By the way this is kind of an asshole arrogant statement.

I can guarantee you I know many things you are ignorant about. You know many things I am ignorant about.

It has ZERO to do with intelligence.

You just can't know everything. You learn things based upon what you are exposed to, your interests, and your experience.

Being ignorant does not mean unintelligent.

Being wrong does not make someone unintelligent.

You learn basically in two ways. 1) You are ignorant and thus you encounter new knowledge and learn, or 2) You are wrong and you learn from your mistakes.

If you don't learn from your mistakes... that I'd agree is unintelligent.