People will always find a reason to be an assholes, but largely a matter of having nothing in common. There is a reason why I'm in a 23 and older only clan and play pretty much exclusively with them. Most 13 year olds understand why they don't want to play with [i]most[/i] 9 year olds. When you're 16 you'll understand why you don't want to play with 13 year olds, and when you're in your mid twenties you'll understand why you want to only play with adults. Honestly, at 30, while I wouldn't insult most 13 year olds, it's very awkward to interact with most of them since we have nothing in common outside of destiny.