scout had the impression that fine folks were people who did the best they could with the sense they had. aunt alexandra opinion was the longer the family had been squatting there on one patch of land the finer it was .

I don't think that's the quote..... none the less; Scout is a realist, and she has a lot of common sense. She doesn't need to be told the difference between what's right and wrong because she watches and listens to the things around her. She bases her opinion of people and families for what they are. Aunt Alexandra forms her opinions of people not fir what they are, but rather for what they have.