Yes, you can always walk away and sometimes walking away IS the best option. However, there's this thing called money that we all need to acquire in order to survive.
Most people simply can't walk away and they're stuck in a dead end job where they have to deal with management who doesn't value or respect them. That's reality.
There simply aren't enough good jobs out there for everyone. Some people will have the ability or luck to escape these horrible jobs but the majority will either remain stuck or quit and end up being poor because they can't find a suitable replacement job.
I'm not against thinking positive. Sometimes it will help keep you sane but I'm also a cynic and a realist. The way the system works, the vast majority of the working class will suffer. Unless we can change the system, there is no escaping this reality.