The Hindu caste system forces 15 percent of India's population to do jobs deemed “unclean”—anything that involves contact with bodily fluids, such as leatherwork and laundry or burying the dead.
I think also being a police officer requires you to get your hands a bit more dirty; maybe use physical force to restrain criminals, maybe be faced with very difficult situations as well.
Better AI and robotics could take over many of the jobs that we don't want to do, or that are so important to get 100% right, like air traffic control.