That doesn't make sense. If he'd been doing something before, as you claimed, she could have said "look, I'm really sorry, but you were all doing those chavvy things, and banging on the glass". She didn't, she opened the door to confront them for no reason.

The debate is about the treatment of the customers by the slaves. Whoops, I meant food service workers expected to be civil.

This is the debate, and should stay here.