I've seen the 2009 boys argue with each other on the field. Very good team but a little bitchy with each other not really a team first atmosphere.
I've seen the 2010 boys argue with the ref to the point that he had to tell them to stop arguing every. single. call. I gave him a lot of credit, he was just shaking his head and laughing at them. Oh, and they were handling the other team pretty well, it wasn't like they were being slowed down by fouls being called against them.
They were also doing ticky tack bullisht things like standing directly on top of the ball when the opponent had a free kick (that earned one of them a yellow), kicking the ball away when they got called on something, etc. Like they all think they're Sergio Ramos or something. 10-year olds.