I suggest you send him a link, promising that the information on it will thoroughly answer any of his questions, but the link is actually to a picture of a pig pooping on its own balls. Specifically, this one.

If he attempts to address the fact that this in fact is not an argument, but is in actuality a picture of a pig pooping on its own balls, then you should apologize profusely for the confusion, and promise that you’ll actually send him the correct link this time, and include another link, but this time the link is to the same picture of the pig pooping on its own balls, rehosted on a different image hosting site. Repeat ad infinitum until he gets the drift. Never let him get the last word, instead insisting on sending him that picture of the pig pooping on its own balls.