What is it with these teens anyway? How can they be so self-absorbed, and selfish? How many times have you found yourself saying to your teen: "I ask so little of you, you can't even do this one thing, after all the things I do for you, even just this one thing you can't do?????"
You are right when you say that it doesn't make sense. Cause it doesn't. How hard is it to put the lightbulb in the socket, or put the pot roast in the oven? Obviously not hard. It may be that it is your delivery system of expectations that isn't working. Notes, too easy to ignore, in-person requests, to easy to dismiss..."I'll do it!!!!!!!" But of course they don't. Why? Cause there is really no real motivation to do it. They don't really care about the pot roast, until of course it's dinnertime and they are STAARVING, and they get pissed at you for not having dinner ready!! "Hello, am I crazy, did I not ask you to turn on the pot roast so dinner would be ready!! Crazy making.
Find a delivery system that will work. Is it a text? Is it an alarm on their phone? Is it a denial of a ride request, money for the weekend, new outfit. As in "gee honey, I'd love to do, take, buy X for you, let me know when you put that lightbulb in your bathroom. But I will tell you what doesn't work, and that is the yelling, and the lecturing that they only think of themselves. The truth, they do only think about themselves....for now. Your son or daughter does not have a character flaw, you have not spoiled them (unless you have), they are in this moment of time, and they do need your help, just not the yelling kind.