The worst skill is cooking, but that's only because the fact that it starts fires is ridiculous. I could count the number of times I've ever used a stove irl on one hand, my cooking skill relies heavily on the microwave, and yet I have never, not once, set my kitchen on fire. And this is coming from someone who once left cookies baking in the oven until they were black.
You either have to have an incredibly unsafe/busted stove, or do something really, really stupid like heat up a pizza while leaving it in the cardboard box, to start fires while cooking irl. If you want a bad consequence to the cooking skill, it should be less than edible food or something, wasting the time and money making it, or maybe mild food poisoning at the worst of it.
