I'm pretty certain that a lot more interaction occurs through phones than through jeans.
As an adult, some of my friends have asked me to switch to an iphone so they could use imessage features in a group chat. It's not hard to imagine being left out of a group for this reason. I don't think I've met a girl in my age group who has anything other than a negative opinion of "Android Users." This stuff doesn't bother me, but I can see how it would upset kids.