I was just thinking that all of this reminded me of my first job out of high school. I worked in an old hardware store. We threaded pipe, cut glass, fixed windows and nothing was blister packed. Almost every one that walks into a hardware store has a problem at home and they're not happy about it. Within months, I started to get tired of the attitudes and rudeness.
But then it hit me. Their problems are puzzles that I get to solve. I like solving puzzles and so that is what I focused on. Try to get to that point and you won't even notice how they treat you. We find what we look for. Search for the thing you enjoy, not the thing that upsets you.