What are some insults in that the capulets and montagues use in the story ?Shakespeare insult : the montagues and the capulets carry on their feud...

Insults abound in Shakespeare's Romeo and
Juliet. I'll just list a few for you.

In Act
3.1.126 Tybalt calls Romeo a "wretched boy" just before they fight and Romeo kills
him.

In Act 3.1.56-57 Tybalt calls Romeo a "villain" a
little while before Tybalt kills Mercutio.

And in Act
1.5:73 Tybalt again calls Romeo a "villain":

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It fits when such a villain [Romeo] is a guest
[at Capulet's party]:...

This
is the party at which Romeo and Juliet see each other and instantly fall in love.  This
starts it all, of course, and leads to the two killings cited
above.