Scout's response illustrates her innocence and perspective. Scout realizes that social factors and opportunities play an important role in one's social class, but do not represent an individual's true character. Scout believes that each person is born equal, regardless of race or class. Her perspective and beliefs reflect her father's tolerant disposition, which he has successfully passed down to his daughter.
In order to better understand that quote, one has to contrast it with Jem's view of people, the division in four types of "folks". By contrast, Scout's position regards only one kind of "folks", just "folks", that is, just humans.
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