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There are different ways that a job can be difficult. Some are physically demanding. Some require a lot of skill (and/or luck). Others can be psychologically challenging. Some are a combination of those and more.

I used to work in retail customer service. Honestly, I saw it suck the life and happiness out of some of my coworkers. People would have breakdowns or turn to drugs and alcohol. One of the reasons I was able to handle it is because I knew it wasn't life long career for me, it was just a job to support myself while I was in school but it left me with a lot of anxiety and maybe, to some degree, PTSD or something similar.

There are a lot of responsibilities and expectations for that type of job. I had to manage the front-end staff. Make sure folks showed up for work, got out on time, got their breaks, performed their duties, make sure they were safe. That was a job in and of itself. I also had to count money, checks, run reports, and a bunch of general office / accounting duties. And then on top of all that, any time there was a problem, I was the first in line to have to deal with it. So, a large number of my customer interactions were with unhappy people. Way too many angry people who are rude, disrespectful, lack empathy, and are so demanding. Lots of ungrateful people and lots of scammers.

The icing on the cake is that the schedule is highly irregular and the pay is crappy.

Really, a customer service job like that is a lot of exposure to a lot of bad people and a lot of horrible behavior. It can be exhausting and mentally damaging. More than most people might realize.