the restaurant spends resources (both physical and human) cooking and serving you the meal, likewise for the barber. a better example would be showing up late for a cinema showing so that you deliberately avoid watching the adverts and trailers... which i would guess most people would agree is morally fine?

The more direct cinema example would be sneaking into the theater and there were empty seats (so you did not deny anyone else access to the movie). Is that morally fine? You watched the movie, the creator doesn't get paid.