Let us remember what happens in this scene of the amazing tragedy of Romeo and Juliet. This scene shows us the banquet that Lord Capulet is holding at his house and that Romeo and Benvolio are going to crash. It is thus that we are introduced to a very merry Lord Capulet. He is shown to offer a warm welcome to all of his guests and to try and induce the appropriate tone of merriment and festivity. Note how he is introduced:
Welcome, gentleman! Ladies that have their toes
Unplagued with corns will walk a bout with you.
Ah, my mistresses, which of you all
Will now deny to dance?
He thus encourages his guests to partake of the opportunity to dance and to make merry. His happy mood will even tolerate the presence of Romeo, and he acts to swiftly quash any attempts of his nephew, Tybalt, to attack Romeo and thus ruin the party. We see a very different character in this scene than we do at the beginning of the play.
This is an interesting question. Capulet's mood at the beginning of the party is jovial, "Welcome, gentlemen! ladies that have their toes Unplagued with corns will have a bout with you......" Capulet is full of little quips to get his party started. He is master of his domain. Although he wants Juliet to decide on the fair Paris, Capulet feels this party is but a prelude to the eventual union. When Juliet refuses the arranged marriage to Paris, Capulet gets pretty crazy . He basically calls his daughter a strumpet and throws her out. Here we see the traditional role of Shakespearean men. Most women were either to be worshipped or scorned. There was very little in-between. Juliet is his "jewel" until she no longer obeys him. It isn't so much that Juliet is in love with Romeo more than she has displeased her father. Thus Capulet becomes part of the greater tragedy. The feud with the Montague’s pales in comparison to the violence that Capulet shows his own daughter, "A you be mine, I'll give you to my friend;And you be not, hang, beg, starve, die in the streets...." Shakespeare also uses Capulet to expose further hypocrisy when Juliet becomes his "jewel" again after she is found dead.