To not eat food you possibly may want a refund on. If this situation happened to me I'd simply keep the food as you know I bought it and I got what I paid for. When I'm going to eat it is irrelevant to the folk selling me said food.
Id be fine if it were reasonably priced. Or if I had been allowed to bring my own food. But its not reasonably priced, and most places dont allowed outside food. In this case, he never bought the food with the intention on getting a refund. But he did intend to eat it during the film. But the film never played correctly, but his friend had eaten some of the food already. Its understandable to want a full refund. Or, at least to be reasonably charged for the items...
The food is priced as it is because the movie theaters make very little money from people buying tickets. If they charged a more reasonable price for the food most theaters would go out of business.