That is .. as long as you don’t take on the burden of proving good cause to quit by writing a glowing resignation letter.
Resignation letter are, aside from your last chance to thank everyone .. a document. You have the ability to render it useless to an employer as evidence you voluntarily resigned by stating succinctly, the real reason and possibly, a well worded objection (as if testifying already) to why you are leaving.
And that .. is because you were told .. take the demotion for poor performance or we’re going to fire you .. because we don’t need good cause to terminate at-will employees.
Of course, some might think of changing an employer’s tune by leveraging an employee right having to do with one of the protected classes of employees that can be discriminated against .. let’s say .. maybe age discrimination?
It’s not revenge, but if one can play the game thinking you’re just ignorant of what protect you.. why not give an employer pause about the possibility of what they really fear .. getting caught .. stomping all over employees rights and facing an even worse financial liability .. we will just refer to as an employment attorneys hourly fee to combat EEOC complaints and the like.