Two researchers, Dunning and Kruger, ran a study. And what they found will make the hair on your neck stand up. The people who were the worst at something, the absolute bottom of the barrel, were the most confident that they were great at it. Read that again. The dumbest people in the room were the surest of themselves. And the people who actually knew their stuff? They were humble. They doubted themselves. They assumed everybody else knew just as much as they did. Essentially the dumb fucks of the world are the loudest and most confident even though they cannot pass tests or even have a reasonable knowledge of a subject but act like they do and the dumb people of the world believe them without questioning it.