Guess it depends on your def of snobs - or slobs, come to that. A priori they demean whomever they consider beneath them. But, on reflection, you might say lots of fairytales fit the bill.
In Cinderella, for example, you root for Prince Charming over the stepmom and step-sisters.
Plus any where the snobs are having to live as slobs and fight their way back up, such as films about Anastasia, The Man in the Iron Mask, lots of Dickens, Sense and Sensibility etc.