It's difficult for you to make a rational decision. You're outraged by a terrible injustice. Resist the temptation to get revenge on someone who has been abusing their power. Stooping to the level of a toxic person will reflect poorly on you. Do your best to fulfil your obligations in a gracious, efficient way. Everyone will admire your ability to show grace under fire. Don't be surprised when you're offered to replace the person who has been offending you. It's obvious you're far more capable of handling their responsibilities.