It's worse than that. They're narcissistic and think they have the answer to every problem. I worked for a boss like this who had Aspergers syndrome (undiagnosed, but clear case)
He literally had bumper stickers made up with "[his name] is the answer" - he wasn't joking. If there ever was a problem he would immediately solve the problem in his mind, and that was the way we MUST do it. He would not accept rationalization as to why that might be a bad idea. I learned real fast not to tell him we had a problem.... until I already had a proposal, who was involved, and costs involved to fix the problem before he had a chance to solve the problem himself.