I was assuming this discussion was about adults, not children. Teenagers have always found petty reasons to reject others, but they usually grow up and learn better. This seems no different, so that part doesn't concern me much. If adults are doing it, though, that's entirely different.
Pretty much. Peer pressure is an insanely powerful thing when you're young and trying to fit in and Apple knows teens aren't gonna die on the "stick to an Android to stick it to them" hill.