Everyone is wired different. I've never been in a fight my entire life and I'm 31, not even when playing hockey for 15 years growing up. I was and still am extremely patient and mild-mannered. I've had teammates like Miller and never gave them even an ounce of second thought or attention.
Miller, to me, seems like a "act how I want you to act or else" kind of guy.
Maybe if he had the actions to back up his desires, Petey would listen. However, this is one of the lazier players so naturally Petey and others see right through it.