There's no point in reasoning with him, he isn't going to make any sense. I would ignore whatever he's saying because he likely doesn't mean much if any of it. I think it's in the book The Addictive Personality that the author says trying to reason with an alcoholic is like trying to reason with a paranoid schizophrenic who thinks the FBI is following them. They are not mentally healthy so you know you can't convince them that they are not being followed. The book says an addict is the same way--not in their right mind, not making any sense, and incapable of being convinced that they make no sense. Addicts have their own private (literally insane) logic and they need it because it's what enables them to ignore reality and keep drinking.