Scott -- this is all tricky stuff to give advice on. There has been an awful lot posted here on the UT over time about the benefits of VFP. Certainly, you know many of these benefits, so you could begin by trying to educate him, or engage him in some level of discourse about the product.

But, this probably goes beyond just the technology POV, as Cindy points out in her response. He may well be a bit of a know it all, and personally I find know-it-alls to be quite difficult to navigate around. You'd be smart to assume that you'll be working with this guy for a while -- so mix any confrontation/debate with a heavy dose of professional interaction/assistance. I assume you don't want to make an enemy, and you don't want to be run-over; it's hard to digure out the middle-ground approach in these cases.

You might even see what you can learn from this guy, and in the midst of all that, educate him about why you think Fox is best suited for the jobs at hand. Several responses to you seem to make the assumption that this fellow is not good at his job, though that seems a leap - nothing you said indicated that he was or wasn't a talented person, just that he is wrong on one point. Responses like that are no more fair, sensible, productive, or professional that your work colleague's attitude ("he doesn't use my language so he must be stupid"). Try not to fall into that attitude yourself. My guess is that it would do no good.