There may well be sound reasons why an iPhone is a better device for him, but the real reasons are probably that:

1) Everyone else has one, so he should have one as well to make himself feel better.

2) iPhone is the best device for people who have limited understanding and minimal demands from their mobile device.

These points are not an attempt to knock iPhone (for which I have great admiration); I believe most people buy one because their peers have one or because they are ignorant of the different capabilities and potential of the wide range of devices available.

If he's having to resort to insults and name-calling as opposed to reasoned and well-researched discussion, he's already lost his own argument, hasn't he?