Many factors make up how bearable a job is, but by far one of the biggest is what the management is like. In the average business, it is the people above you that make the rules and set the tone, and no matter what the role entails or what your other coworkers are like, it is this that could make or break the experience of working there.
Pretty much anybody who has been employed has experienced the misery that is bad management, and it can be particularly bad when the person you are dealing with also happens to own the company. It feels like an extra level of powerlessness if the job isn’t going well, which means that any opportunity to push back against that feels extra sweet. One of the few benefits of having insufferable higher-ups is that they can make mistakes that are easy to exploit for your own satisfaction.