They're either really lazy teens, or they have never cooked for themselves before.
I know I've cooked for myself and the rest of my family. I've heated up Clam Chowder, cooked Kraft Mac and Cheese (it took a few times to get it right. At one point I accidentally made Mush and Cheese
). And I actually heated up some Calzones with the oven. It was my first time working with the oven, and yet the Calzones came out perfectly. So I know how to use the stove, oven, and the microwave (but then again just about anybody can operate a microwave
)