Also, if you count on your defense to lay it all out there, as a pitcher, bad mouthing your teammates won't help much his cause. A player can claim to be the biggest cheerleader in the dugout but if the player's bad mouthing his teammates, then that cheerleading in the dugout will come off as a phony and will come off looking like the game is all about the player.
I think I have a little insight on this since my son was a team captain in his winter sport in HS and his American Legion baseball team and was a vocal leader on his varsity baseball team even though he wasn't a captain. He knew on his teams who cared or didn't but the last thing he'd ever do is to rag on his teammates. Let the coaching staff deal with attitude issues.