Either way, what you said is something Bertrand Russel (certainly not best known for being a dumb man) once worded like this:

"The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt."

.. and just for good measure, here is another one of his quotes, which is hardly well know to those who would probably be better off if they did:

"Our great democracies still tend to think that a stupid man is more likely to be honest than a clever man, and our politicians take advantage of this prejudice by pretending to be even more stupid than nature made them."

In summary: ignorant people do appear to often be more confident than they deserve to be. Whether that is actually because they are truly unaware of their ignorance, that could certainly be a good question to ask oneself. For there are plenty who deliberately abuse both faked ignorance and confidence just to bamboozle and deceive others.