In the Disadvantages of Perl? meditation I started, I got alot of well thought-out responses saying, among other things, that there is a purpose for every language and a language for every purpose... I think that this applies in this situation because both langs probably have advantages over each other in certain areas.

So to answer your question, I would ask him about specifics. If he is just being a PHP nazi, he won't have anything to say...and if he actually has some reasons, it should be an interesting discussion.