The context of the following conversation is Austin had Taylor by the short hairs and refused to give him any room to move.:
Austin says Taylor had grabbed me by the hair and refused to let go..
The friend responds Why did he do that?.
Austin responds He was being annoying.  I don't know why he doesn't most things..
The friend responds He needs to grow up..
Austin responds I have to live with him everyday.  He's my bothersome brother..
The friend responds Maybe he's just bored and wants to play..