Because he doesn't hide much. He will do whatever he does however egregiously vile vulgar evil corrupt and while doing it he tells you to not believe what you are seeing because that is not what is really happening.
AND YOU BUY IT! No wonder he is certain of you because you never fail to defend him. Even when even as even though. If it's pouring rain and you are drenched and the dumb of don tells you it's a lovely sunny day you will believe him and completely ignore how wet you are. In a trance maybe. Hypnotized? Lobotomized?.
So maybe he is right to have contempt for your "thought"mechanisms. You don't believe what you see or hear because you are told that is not what is really happening. I dunno if that would register on any IQ test. How low can you test for dumb?