I always thought of it like this: if a workplace makes you feel devalued or is toxic (gaslighting and ranting about you behind your back), you quietly find new pastures.
Now, however, I think this is the wrong approach: why do I have to accept they bully me? I should defend myself. And doesn’t the manager have to make sure a workplace ain’t toxic? Instead of quietly looking for a new job next time this happens, wouldn’t it be better to confront, document and escalate instead of letting it go? even if HR only exists to protect the company and not me.
If HR and manager do nothing to address the problem, wouldn’t it be a better strategy to start working the least possible and let the company fire me, while looking for another job?
Doing your job and looking for another job is the best course of action if they don’t do anything about issues involving other coworkers. If they don’t care enough to do anything when it is reported, they are not going to do anything if you give an ultimatum other than making your job miserable enough that you quit or fire you, whichever costs them less.
Don’t under perform in a way that gets you fired though, as that could jeopardize any money you get from being fired like unemployment or whatever you have in your location.