The customer is always right, or maybe?

Eataly is a large footprint, highly successful Italian immersive marketplace chain (sort of food hall + grocery) comprising a variety of restaurants, dining and drinking areas (not defined by walls), food and beverage counters, bakery, retail items, and a cooking school. If you think the customer is always right, you might want to ponder Eataly's policy on it. This is the sign they have posted at their entrance in the downtown Chicago store.