Dealing with jerks or being a jerk and experiencing the push back is part of normal social development and self-discovery. The article doesn't really mention why this is a bad thing, and just say that "this is exclusion, bad feeling, thus banned". That doesn't really compare to physical fights, and even then rough and tumble play is necessary for development. The role of adults is not to put a rigid road but have a big arena with clear and solid barriers around.