With great intelligence comes a greater awareness of the fault of everything and the greater the chance that he is isolated or alienated. Charlie realizes that before he had no realization of the truth of things. Ignorance was his best policy. He was not aware of people treating him differently and did not have to worry about fitting in or becoming smarter than anyone else. He had his routine, he did his work, he was peaceful and comfortable because he didn't know any differently. With a greater awareness and greater intelligence, he could see what was wrong with things and he is now the object of jealousy and resentment.