If you have come across one such specimen, you will understand what I mean. There are some who think that they know everything about everything. This, even when they don't know to differentiate black from white.
Along with this thinking comes a superiority complex, an attitude that they are the best in the world. That the Einstein's in the varying fields knew lesser than them. The disdain they have in their eyes for other's opinions is resentful. They care two hoots about hurting someone else's feelings for they are blinded by their own mirror image.
All I can do is pity them their ignorance, their immaturity. However, it is difficult to do that when you are standing in front of one such.