For a long time, DC's magical world had seemed highly orderly. The contracts mages signed with Demon Gods looked perfectly legitimate, the hierarchy of power was clearly defined, and all kinds of institutions operated in an orderly fashion. On the surface, it was quite a civilized society.
And Constantine was the scum cast out by this civilized society, a notoriously awful person and con man in magical circles. For a time, he could practically have been called a disgrace to humanity.
But that was not actually because he was truly so terrible. Although Constantine was a bastard, never uttered a single truthful sentence, and had a chaotic private life, from humanity's standpoint, he still counted as a good person. So why had his reputation become so atrocious?
In short, the order of DC's magical world was false, because it had not been established by humans themselves, but by demons and angels. They needed such an order to exploit humanity, so naturally they maintained the stability of this society.
Constantine did not follow this society's rules. He swindled demons, then swindled angels, so naturally the demons and angels did everything they could to have their followers smear Constantine.
Constantine had never received any particularly formal education in psychology or sociology, especially lacking a certain amount of sociological knowledge. Over time, he came to believe that he was one of the bad guys in the magical world, that the things he did were too shameful to speak of and unfit for public display.
But the difference between him and Professor Strange was that Strange had a good teacher. As he had said, The Ancient One was the most powerful Sorcerer Supreme in history. She could be called Marvel's magical world's heaven-sent chosen star, having beaten the vast majority of Demon Gods eyeing