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It's possible--encountering him and seeing what life on the streets is 'really like' might have made her think about things she never had to consider. After all she honestly had not realized she had to pay for things or be punished. But he taught her that class is not just your upbrining it is how you carry yourself and treat others.

Jafar the Royal Vizer is well-robed but is extremely rude to others including the Sultan himself, who is hypnotized for mind-control purposes. Whereas Aladdin is polite even in his street clothes--to two children.