I think even your list isn't bullshit jobs. The world needs cart returners, landscapers, etc. And replacing jobs with the customers doing the job doesn't seem particularly desirable either (and proves those job aren't bullshit).
There are people with real bullshit jobs; you can find people describe them online. Where they are employed, they actually do work, but they know that work doesn't contribute anything. They are usually depressed about it.
I have a job where I do actual work. I have clients who require my assistance to perform their jobs effectively. However, the jobs _they_ are doing fundamentally do not add value to the world. In turn, that means my job adds nothing of value to the world. Yes, I am on anti-depressant medications primarily because I am wasting my time on this planet performing a bullshit job.
There are people with real bullshit jobs; you can find people describe them online. Where they are employed, they actually do work, but they know that work doesn't contribute anything. They are usually depressed about it.