You were doing your job by greeting and serving customers beer. You were serving a group of drunken men some liquor and right away they would try to flirt and get their way with you

You felt uncomfortable to the point where one of the drunken men would try to touch you, this immediately got the attention of another man. He grabs the drunken man's wrists and pushes him away from you

"It's rude to touch a lady..."

He says coldly while glaring at the drunk man, then looking back at you