As adults, we have recourse against bullies.
If we're beat up, it's considered assault and battery, and the perp is arrested.
If our lunch money is stolen, it is theft and the perp is arrested.
If our reputation is smeared and we're called foul names, it's slander (or libel if printed) and we have recourse.
If we take a job with an obnoxious coworker who the boss won't reprimand, we can switch jobs if necessary. Not the easiest or most convenient option, but an option, nonetheless.
Kids in schools are told to suck it up and take it, and bully punishment (in a lot of cases) is a joke. Nobody should have to take what bullies dish out. Especially kids who are the most ill-equipped to handle it.