What is most clearly revealed about Mercutio in this excerpt from the long speech he makes about Queen Mab in Act I, Scene iv, of The Tragedy of Romeo and Juliet
He is playful and imaginative. He is showing his playful side, instead of his vindictive side. Romeo believes that dreams are real and can be an omen or blessing of things to come. Mercutio does not believe in dreams and it is all just a fallacy.
