Today, my sibling/business partner was unusually rude to me. Right afterwards, she ordered me to do some work on a new project that she is obsessed with. I don't feel like dropping everything to obey her orders because she does not have the right to act like she's my boss or expect my cooperation right after she was nasty to me. So I plan to refuse and take the rest of my Sunday off.

When she confronts me about not doing what she wanted, I am considering telling her that she can't treat me rudely and then order me around. I want to know if it is a bad idea to say somethings like that to a narcissist?