What techniques does the author use to emphasize lower class prejudice in To Kill a Mockingbird?Harper Lee's To Kill a Mockingbird

Perhaps the predominant method by which Harper Lee conveys
class prejudice is through the use of dialogue.  For instance, Aunt Alexandra is the
voice for class distinction as she tries to counteract the liberal influence of her
brother Atticus by discussing the eminence of the Finches in Chapter 13.  Later, he
tells Jem,

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"Your aunt has asked me to try and impress upon
you and Jean-Louise that you are not from run-of-the-mill people, that you are the
product of several generations' gentle
breeding---"

She is adamant
about Scout's not inviting Walter Cunningham to the house, telling her, "...they're not
our kind of folks."  Further, Aunt Alexandra says,

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"That's your father all over again," said Aunt
Alexandra, "and I still say that Jean Louise will not invite Walter Cunningham to this
house. If he were her double first cousin once removed he would still not be received in
this house unless he comes to see Atticus on business. Now that is
that."

When Scout asks why,
Aunt Alexandra explains that he is "trash."  She tells Scout that she does not want him
around because Scout will pick up his habits and learn
"Lord-knows-what." 

Scout and Jem's cousin Francis echoes
this kind of thinking,

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"Just what I said. Grandma says it's bad enough
he lets you all run wild, but now he's turned out a nigger-lover we'll never be able to
walk the streets of Maycomb agin. He's ruinin' the family, that's what he's
doin'."

That Aunt Alexandra
is snobbish comes through with one of Jem's comments to
her:

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"Aunty," Jem spoke up, "Atticus says you can
choose your friends but you sho' can't choose your family, an' they're still kin to you
no matter whether you acknowledge 'em or not, and it makes you look right silly when you
don't."

Later,
Jem explains the class system to Scout, telling her that there is
the

ordinary
folks like us and the neighbors, there's the kind like the Cunninghams out in the woods,
the kind like the Ewells down at the dump, and the
Negroes.

In addition to the
use of dialogue as a means of conveying the class prejudices, the actions and reactions
of characters also express the distinctions.  For instance, while Bob Ewell is on the
stand, his reactions to Atticus's questions indicate his sense of inferiority as he
misconstrues Atticus's intentions as being to ridicule him.  Also, he retaliates against
the humiliation that he experienced in court by Atticus's proving him a liar; he spits
in Atticus's face in a public place.  Thus, through her characterization methods, Harper
Lee portrays the class prejudices whether they are real or
perceived.