Comment by chasd00
If a customer noticed and called a cook out for intentionally dropping their food on the floor and serving it to them i think that would be the death of the restaurant. Or at least cause the local health department to get very interested. What most likely happens is the customer doesn't even realize. If that's the case, then from the customer's perspective it didn't even happen so what's the point of doing it in the first place? You got revenge on no one.
Maybe they get sick later and don't know why.
Or maybe it's a harmless way to vent frustration, and remind the cook that picky customers are ignorant pseudo-elitists.