Tybalt was still smarting from what had happened the night before. His vow to get revenge was still fresh in his mind. Tybalt immediately began shouting insults at Mercutio. Mercutio answered with more insults. Just as the argument was about to turn violent, Romeo happened by.
You are a villain! The fiery Tybalt yelled at Romeo. No, Tybalt, I am nothing of the kind, Romeo answered calmly.If you knew me better, you would never say such a thing.
But Tybalt truly hated all Montagues. He was deeply prejudiced against them,though he didn't really even know why. He kept taunting Romeo. Romeo,because he was now married to a Capulet,sincerely wanted to make friends with Tybalt. Tybalt,however,would not listen to reason. He was just too angry.