Players with the same native language always group together. That's inevitable. Sometimes you get a weird Evra-Tevez-Park mix. That only happens really when there aren't any other players around from the same background.
I remember being in the Old Trafford tunnels after we beat Chelsea to all but clinch the 2011 title. Didn't matter what team you were in, the players were divided by the language. Drogba, Kalou, Evra, Essien, Anelka in one place. Luiz, Ramires, the twins, Nani, Anderson in another etc. It's a natural camaraderie based on language and culture.
Whether they act like dicks or not is solely based on their character.