Retail is a prison sentence everyone should have to serve; some of these people will then hopefully learn not to treat the staff like shit.
It's not literally all bad. I worked at a 24 hour pharmacy down the street from the ER. As much as a nightmare the homeless thieves, the drunks trying to get booze before the 2am deadline, and just the random foul-tempered, surly normal customers were; the people possibly having the worst day of their lives, 12+ hour vigils at the hospital, very much appreciated a friendly face and efficient service. Sometimes you got to make a difference in somebody's life and that feels great.
"But don't give up hope. Everyone is cured sooner or later. In the end we shall shoot you." - O'Brien, 1984