They should have all stood up and said "I'd like a cheeseburger to go too!"
I mean, would have been worth a shot at least.
share
The boring answer: none of US would’ve been in that situation to begin with
The patrons were all chosen because they were world-weary and, aside from some token resistance, were eventually going to accept death to escape the boredom their lives had become
That’s why the chef was so upset with Margot’s presence. She didn’t fit in with that clientele, and thus spoiled his “menu.”