It's called the Dunning Kruger Effect. Know anyone named Trump who fits that description? Really!
http://www.salon.com/2016/09/30/idiocracy-now-donald-trump-and-the-dunning-kruger-effect-when-stupid-people-dont-know-they-are-stupid/
http://www.salon.com/2016/09/30/idiocracy-now-donald-trump-and-the-dunning-kruger-effect-when-stupid-people-dont-know-they-are-stupid/