I know what you mean GrayGhost. He is just such a good kid I can't watch the downward spiral. I feel strange saying this but I think I am kind of a "role model" in this kids mind. If he does take me up on the offer I'm not going to start throwing face punches right off the bat or anything because I know they wouldn't be received well.
Well, if this kid really likes you and takes what you say seriously, you could try sitting down with him for a while and showing him some of MMM's math-heavy posts. For me, the most astonishing one was the Shockingly Simple Math to Early Retirement, because it is a simple graph that shows you the results of saving.
And you can also point out that you don't have to give up real luxuries in order to retire early. You can still live in an awesome house, have great food, friends, a car, running water, and other stuff. You can even travel, eat out, and engage in other things like that--just not to excess. You can also point out that the law of diminishing returns very much applies to cars and houses and stuff like that.
I guess a real problem with Mustachianism is that it's so hard to spread. Isn't that strange? It's relatively easy to convince people to vote one way or the other, you just have to employ some flash rhetoric and a few snazzy photos, but if you want them to live happier, safer, more sustainable lives, it's like pulling teeth!