I've said outside the emergency services (police/ambulance) because it's generally expected to see high numbers of awful behaviour through crime/pain/emergency situations etc.
Which jobs do you think see the worst in people? I work in catering and was thinking this today as we regularly have rude, entitled people who can generally look down their nose at you which i had a lot of today. Obviously jobs have good and bad customers/guests/clients but what are the worst in your opinion?