It is clear, from Atticus's and Scout's explanation of the social hierarchy in Maycomb, that the Cunninhams are a poor but proud family. As Walter Sr. is a farmer, and as farmers were hit particularly hard during the Great Depression, Walter is unable to pay Atticus with cash--so he pays him with food he has grown. Likewise, Walter Jr. has learned that he should never take anything that he can't repay, and as a 6-year-old, he has enough discipline to not accept lunch money from Ms. Caroline--even though he is hungry.
While reasonable readers see the Cunninghams as good people, Aunt Alexandra, who is primarily concerned with appearances, is only able to see their lack of money and education. It is clear, as the novel progresses, that Atticus and Alexandra don't agree on the importance of appearances. Obviously, Atticus values people for their inherent goodness, not their color, finances, or education.
The basic difference between Aunt Alexandria's and Atticus's views are that...
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