Okay, no matter how drunk someone is, there's no way they would act like that. But it does depend on the person, I guess. I mean, the worst I've dealt with was slurred speech and dizziness. I don't think being drunk ever forgeted up my spelling/grammar that badly or made me want to forget my cousin or whatever he said.
He isn't an alcoholic, there's no reason to feel sorry for him.
Yeah, he's being really flamboyant about his drinking either to get pity or to be funny, or appeal to people. But it's not really working. And even if he does drink that much, it doesn't really mean he has an alcoholic addiction. Damn.