That's a good one. I've always liked that argument. It is essentially saying that since you cannot prove the Flying Spaghetti Monster doesn't exist, then therefore it must exist. As with all Gods: Krishna, Jehovah, Yahweh, Zeus, Apollo, Allah, etc, etc, etc, etc, etc etc....It's a nice way of making the point that none of those Gods exists and they were all created by man, like the Flying Spaghetti Monster.
The difference between all of those God's and Jehovah is, Jehovah makes things happen. The rest of them, not so much.