Ok, let's say you want me to fix cars. But all the tools are in a gigantic pile in the basement with no light and there's a rule that I can only use one tool at a time, so, if I come back up with the wrong size socket wrench you call me stupid because I should have known what size to get before I went down there, I can't work for you.
Or there's plenty of work to get done but I can only do half of it each week because the work hours need to be split between 10 other people who don't give a shit and so I have to find another job halfway across town that I have to ride a bus to because they expect me to be there on time and that job has plenty of work to get done but I can only do half of it each week, I can't work for you.
Or lets say I've been working for you for 6 months and I've proven over and over and over again that I can show up on time, and get the work done, and be nice about it but you want to bring in this other guy from a different company and have me train him how to be my boss, I can't work for you.
Or let's say I'm selling your stuff and I can see exactly what you are paying for it and I can see exactly what they are paying for it and I can subtract your expenses and see you living in three different houses with ten different cars but you pay me the least you have to and I can't afford to go to the doctor because stupid me broke my foot when I dropped your stupid thing on my foot because you keep telling me to work faster, I can't work for you.
And really, I've worked even more jobs than that so I could go on but if you are any of the above employer you can just as well tell me to go kill myself because that's what I'd rather do than to work for you.
I mean, I can do anything. Literally, anything. And I don't understand why you don't hire me because I act a little be too enthusiastic in the interview and I've lost out on three good jobs this way. Or maybe it's because you're HR department is operating under the Peter Principle and you don't give a shit about me or the world anymore because you have everything you need? I can't work for you. And fuck you too.