It’s never a great idea to quit a job with no backup plan. You may feel a flurry of inspiration and want to quit in a moment of rage, but in the back of your mind, you know that you shouldn’t because it’s not easy to find a new job. It’s a tough world out there, even if you’re qualified and willing. Jobs get hundreds of applications, and it can be hard to make yours stand out from the crowd. So it’s no wonder that some folks want to hold onto their jobs for dear life, even after they’ve gotten sick of it. There are a lot of reasons why someone would stay in a situation that wasn’t particularly working, so it’s nobody’s place to judge. 

But everyone has a final straw. Everyone has the thing that would make them fully quit. The thing that they just couldn’t stand, no matter what. You don’t care if you don’t have a backup plan; you just can’t stand to do that particular thing. A reasonable one would be a pay decrease.