I've been "fired" once, by a patient's daughter though. The daughter was known on our unit to be veryyyyy difficult, claiming she was an oncology nurse and critiqued everything any of her dad's nurses did (we later found out she was a medical assistant at a PCP office).
The night I was "fired," I'd been given a challenging assignment. 3 patients, including her dad (I worked on a cardiac PCU). One patient, post-op CABG and demanded a nurse or tech to hold his urinal for him when he peed every 15 minutes (is my phone ringing again? Oh yep, he needs to pee again). Another patient on an insulin drip, requiring q1 blood sugar checks and drip titrations (one tech for our floor or 36 patients, so I was typically the one doing the sugars). And then this patient, "dad," who was end-stage heart failure compounded by delirium r/t liver failure; lasix drip, near total-care, very complicated plan of care because his daughter challenged every provider's assessment that didn't align with her wants and needs. I understand not being able to accept a loved one's inevitable fate, but she took it out on every interdisciplinary member that walked through his door. Nothing was ever good enough in her eyes.
Simply, I was overwhelmed with my patient assignment that night. "Dad's" daughter was unsatisfied that I seemingly wasn't in their room often or long enough at a time. She was unhappy about it all, like that I left his water cup on his bedside table (next to him) instead of putting the straw up to his lips directly when he wanted a drink. Unhappy that I took too long to get to his room because I was fist-deep in the urine of my other patient. It was a relief to be fired from this patient! I was not the first to be fired during his stay, either.