I don't believe that he is looking to start a debate. I believe he is simply looking for clarification. There is nothing at all wrong with that. The Muslims that I know are always willing to clarify things for me. They see it as a good thing that a non Muslim is going to a Muslim for a correct answer rather than listening to rumors, etc. No matter what religion you are, you should be proud to answer such inquiries. It is no secret that Muslims do not eat pork.