Retail, easy. Like, I enjoy what I do for my job but the people that my store attracts, make it cumbersome. People coming to me all the time with phones in my face of listings to other stores thinking we have them, people impatient, people thinking we have everything and people being deliberately vague but getting pissed when you ask them what they mean.
Tech support, the number of times I had to explain trivial things to some angry entitled asshat, who refused to read the instructions or didnt try basic troubleshooting steps (eg. turn it off and on again).
Also airport jobs. If people in holiday mode would just look up and follow the fucking signs…