How tired do you have to be to where you can't cut an apple? I'm just saying, I don't think this parent was too tired at all. I think they were just sick of cutting their ungrateful kid's apple. That note took longer than it would take to cut an apple. Have you ever written on a napkin? It takes the patience of a saint. It's not like you can just quickly scribble your words down. All that evidence leads me to believe that this is this parent's way of saying, "your oppressive tyranny is over."
Honestly, kids and parents should make the lunch together. Make the kid learn about the hassles of life, like eating. Eating is a total hassle when someone isn't serving you the food. That's why I eat out so much that I'm broke.