In "To Kill a Mockingbird", what is Aunt Alexandra's definition of fine folks? What are some problems with her definition?

According to Aunt Alexandra, families who have settled in one place for many generations are deemed as being "fine folks." They have a history; they have roots and are a part of the fibre of the local community. Even the Ewells fit into this category as they had been living by the town dump for such a long time.