[CoastalCoder]

I'm not in his camp, but trying to play Devil's Advocate for your benefit:

Are you sure that your arguments are more solid than his?

E.g., are you and he both relying on outside source of information, which neither of you have the time / resources / motivation to verify?

And if so, are you and he just assigning different levels of trust in a given source?

When I've been in situations slightly similar to yours, I was disheartened to realize that my own justifications weren't as solid as I originally thought.

That is, I was still pretty well convinced of my own position, but I realized that the main reason for it was a judgment call and intuition, rather than an unassailable argument.