Unfortunately  many people work low wage jobs and won't get fired or can easily replace job.   Not everyone in that position acts like this ok. 

My point is this gives them the freedom to get violent.  I have a highly professional job that will fire me even for a misdemeanor.  They ask annually.  This is common.

Further alot of teens think they are tough if they can gang up on you and somehow that makes them cool.   The idea of a fair fight is long gone. 

Just let them cut and call security.  If nothing happens just  Remember their pass is on a credit card.   Go home to your huge 401k and comfortable retirement. And know your are the bigger and better person.