Are You a Quack?

One of my friends from my undergraduate schooling at UCLA likes to keep in touch with what most of the scientific community would consider... quack theories. In the process of discussing his ideas, many of which are interesting (if not based in any kind of scientific method that I could discern) and one such argument led me to a site claiming to have made an extraordinary leap forward in electrodynamics.

During the course of proving the new theory on this site, laying out each mathematical step that shows its consistency with the laws of electricity and magnetism, I spotted a math error. (For the mathematically/physically inclined, the site proposed that in a propagating electromagnetic wave, the electric and magnetic fields must be out of phase with each other, even though Maxwell's Equations for the nature of E, B fields require them to be in phase with each other.)

As a courtesy, I emailed the webmaster of this site and pointed out the math error.
Perhaps courtesy was my mistake.
Perhaps I should have Googled him first.

3 months later, I find myself unwilling to simply end my weekly email debate with him, and allow him to think he somehow "won" and yet, if I have to go over the same basic concepts one more time, I think I might just rip my hair out.

Originally, I just found the exchange amusing. He was trying to hard to sound like he knows what he's talking about, with enough scientific jargon to be persuasive from time to time. But as the email exchange continues, I have to fight the urge to direct him to this page. I doubt he'll find it as amusing as I did.