I think I've heard of some kind of God syndrome where the individual believes themselves to have God-like powers. I'm not in the field of psychology but have seen it before. The person I know gets extremely insulted and agitated if you disagree with him. He raises his voice and is very dramatic to the point where I walk away in fear he may resort to violence. He doesn't display this reaction to everyone, only those he's closest to and feels he is in control of. I would just keep my distance and try to limit my conversation with him to mere pleasantries.