Romeo initially tries to diffuse the tension caused by the insult, but eventually retaliates and defends his honor by challenging Tybalt to a duel. His reaction is fueled by a mix of his love for Juliet and his pride as a man.
Tybalt recognizes Romeo, a Montague, at his uncle, Lord Capulet's, party, and believes Romeo intends to insult the Capulet family.
He calls him a villain. A pretty lame insult, and not enough to get Romeo to fight. It is enough to get Mercutio to fight, however. Killing Mercutio does for Tybalt what no insult could do--it gets Romeo to fight him. Unfortunately it does for Tybalt in another sense altogether.
Romeo told Tybalt to take his insult back; Tybalt called Romeo a villain.
Romeo and Juliet have a number of conversations in which Romeo can react to many things Juliet says. In other words, this cannot be answered unless it is more specific.
He says "Thou art a villain." It's a kind of feeble insult.
Romeo does not want to fight Tybalt because he has just married Tybalt's cousin Juliet. So this means they are related and Romeo does not want to harm him. Also to start a fight with a Capulet (because Romeo is a Montague) would have Romeo banished. Romeo does not want to be banished or upset his wife, Juliet, by killing her cousin.
"Romeo, the love I bear thee can afford No better term than this: thou art a villain."
She runs away and pretends to be dead but Romeo believes it and kills him self too. :(
Another monarch might have condemned Romeo to death.
He was really not too happy.
romeo goes to the apothecary to
Mercutio believes Romeo has become feminine after falling in love, but he quickly moves to fight Tybalt when Romeo refuses.