Manners. It was one thing when it was Zuko and her uncle. Their lapse was understandable. And, yes, among the rabble, it might well be something that passed as acceptable conduct. However, so far as she was concerned, anything that was said before a simple greeting was offered was worthless. And not something she would deign to reply to.

"Princess Azula of the Fire Nation. Good afternoon."

That he was a captain was worth noting. The phrase 'Air Pirates' also intrigued her, but her questions could wait. After all, if she wanted someone to act appropriately, it was on her to demonstrate that behavior.