> Stupidity is a very specific cognitive failing. Crudely put, it occurs when you don’t have the right conceptual tools for the job. The result is an inability to make sense of what is happening and a resulting tendency to force phenomena into crude, distorting pigeonholes.

Is a long way of saying "thinking you know something that you actually don't." It's about hidden assumptions, and if there's any psychology to it would be hubris.