We have this problem with my second grader. Though he is interested in what the other kids like he takes it beyond that level. Instead of just talking about some simple ninja game he wants to talk about the history of it or relate it in real world situation when the other kids are happy to just 'be a ninja'. My son always wants to make the game more involved but kids don't want to listen to him explaining out some complicated scheme. (I chose ninja as an example but it the topics are endless).
Because of this he has on many occasions told me that so and so is no longer friends. My son is SO kind he doesn't understand the complexities of mean kids.
