Hm... Probably the best thing you can do for (to?) him is to point him to the boards and have him look through how other groups interact. He thinks that Player vs GM is the only "real" type of D&D experience out there? Post a poll, let the users put in a good number of votes, and then show him the results. You should get some good commentary on the different styles of play as well, and you never know, you might find a new style of play that you've just gotta try out.
After that, I'd say (seriously) set the game up at someone elses place (if it's not at your place, you can convince them not to invite him over), or (non-seriously) start taking Martial Arts lessons. Or you could always set it up so that the gods take an active interest in what happens in the mortal realm. I imagine the first time this happens going something like this:
You: The gods smite you.
Bro: What?! Why?
You: Well, as the DM, I control, among other things, the way the gods react to what you're doing, correct?
Bro: Yes, but...
You: Also, by constantly complaining about how things are happening, you are angering me, correct?
Bro: I guess...
You: And, if you anger me, then there's a good chance that you're angering the gods as well, correct?
Bro: If you say so...
You: And, since the gods are now angry, and we've already established that they take a keen interest in what happens in the mortal realm (possibly show this by restoring the paladin's hand with a divine miracle early on, in exchange for a previously agreed upon quest), what other course of action would they take than to smite you?
Bro: Well, I don't think that the gods would care <b>that</b> much...
You: Would you rather the entire pantheon smite you? How about the Overgod?
Bro: ...
You: Thank you. Anyways, as I was saying...

You're actual experience, however, may be completely different.
Magius out.