Looks like Sam went apeshit, sortof assholish. They should have handled this weird guy with the cup by simply laughing at him, pointing their fingers at him and laughing their asses off. Laughing at someone can REALLY piss them off more than just about any words you can say to them sometimes. Trust me, I do this with people I vehomently disagree with all the time and it not only pisses them off, it often makes them question their own views as being ridiculous.
Sam acted like a cop right there. Not cool.