What four classes of people are present in the Maycomb society in To Kill a Mockingbird?

Jem probably explains this question best during his
conversation with Scout in Chapter 23. Scout had asked her Aunt Alexandra for permission
to invite Walter Cunningham Jr. to the Finch house, but she refused, claiming that
"he--is--trash, that's why..." Scout didn't agree that Walter was like Burris Ewell, and
Jem explained his own way of thinking. According to Jem, "There's four kinds of folks in
the world..."

• "Ordinary folk," like the Finches
  and their neighbors.


• "The kind like the Cunninghams out
  in the woods"--poor people who were honest and hard-working but down on their
  luck.


• "The kind like the Ewells down at the dump"--the
  true type of "trash" that Alexandra had called
  Walter.


• The Negroes of
  Maycomb.

When Scout asked about the "Chinese,
and the Cajuns down in Baldwin County," Jem further explained that he meant only those
people in Maycomb County, and that

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"... our kind of folks don't like the
Cunninghams, the Cunninghams don't like the Ewells, and the Ewells hate and despise the
colored folks."