Some places are just not great places to work. You may have an incompetent boss, a rude supervisor or a clique of coworkers that makes life unpleasant for anyone not in the club. But is any of that enough to make a hostile work environment, legally speaking?
No. Having to work with incompetent, rude, domineering or even outright unpleasant people isn't something that matters, legally. So what does?