I know very few people who argue like how your post describes, when they're drunk , but those people who do, it tends to reflect their sober state in a certain manner as well, even if he's able to hide it for the time being. You may disagree with me, I don't know the guy and I don't know the whole story, but to be honest if he's "demanding" money off you, even though he's known for only a few weeks, it shows little or no respect, drunk or not.
You are in the right. Rules are rules and even though some can be bent, when it comes to the security of yourself and those around you those rules cannot and shall not be bent.
Talk to him about it, when he's sober of course, and get him to realize he was in the wrong! If something like this happens again, just take a minute to think about the guy you are a part of...
Good luck though, and all the best.