Describe how Mercutio insults the Nurse. Cite textual evidence to support your answer.

Mercutio says there are 'two" of the nurse.... a man and a woman. He also says that her fan is better looking than her face, and he instructs Peter to give her her fan in order to hide it.

Two, two—a shirt and a smock.

Good, Peter, to hide her face, for her fan’s the fairer face.