The Grinch wears work clothes
One thing these groups have in common is they are forced to be boundary setters. They must tell others where the line is and then wait for some people to inevitably fall right over it. Sometimes they decide to be proactive and shout because someone appears to be hovering near the line. From my experience in the fourth listed occupation and hearing stories from a few who work in the other fields, I’ve concluded these jobs could turn the sweetest elf in Santa’s bunch into the Grinch in less time than it takes Rudolph to bury his red nose in chocolate.