A friend of mine drove us to a concert, and after we were done, we decided to get McDonald's. Lots of people were doing the same. My friend happened to get a cold patty in his hamburger, and proceeded to go back and complain loudly to the long line, showing them the burger and angrily announcing "It's FUCKING COLD." I was in the car as he was doing this; he told us the story later, and goddamn I had secondhand embarrassment.
There's a psychological bond to fast food. Maybe it's one of the few things people rely on to be perfect, some need that feeling of constant satisfaction. And McDonald's has set their bar so high that people expect the same out of every single chain to operate as efficiently and perfectly as possible. Like it invites and even welcomes the freedom to be a control freak.