When you have your stomach all set for something, it's the worst.

I'm vegan. A lot of places don't have vegan food, so I need to look ahead of time.

Maybe you wanted a specific thing, so you did research and you found a restaurant with the thing, and you get there and they don't have the thing. You've wasted a trip.

Is it the end of the world? No. Is it worth leaving the restaurant? No. Is it frustrating? Yes

Laziness and entitlement.

As a lifelong food service worker customers do not give a single fuck about how what they do impacts the store at all.

And even if it's an upper management issue the employees in the store have to suffer for it.