Captain Barbossa is the sworn enemy of Captain Jack Sparrow. Or is he? These two have a complicated history. Years ago, Captain Barbossa led a mutiny against Captain Jack, taking control of his beloved Black Pearl from him. That wasn't cool.
Elizabeth: Captain Barbossa , I am here to negotiate the cessation of hostilities against Port Royal . Barbossa: There are a lot of long words in there, Miss; we're naught but humble pirates. What is it that you want? Elizabeth: I want you to leave and never come back. Barbossa: I'm disinclined to acquiesce to your request. Means "no."
First, your return to shore was not part of our negotiations nor our agreement, so I must do nothin'. And secondly, you must be a pirate for the Pirate's Code to apply, and you're not. And thirdly, the Code is more what you'd call "guidelines" than actual rules. Welcome aboard the Black Pearl, Miss Turner.