Act 4

I think that William Shakespeare portrays the Capulets as villains. They are trying to cause trouble with the Montagues (Tybalt), and they are trying to get their daughter married to a guy she doesn't even like (Juliet's parents). They also enjoy insulting their own servants.  In Act 4,  Scene 4, lines 15-24, Lord Capulet said to one of his servants, "Thou shalt be loggerhead." This is a  derogatory term for a stupid person. This is why the Capulets are viewed as villains.