What can you learn from the women of Maycomb about proper behavior and improper behavior?

The best place to see this is in chapter 24 at the
Missionary Society Tea.

This scene is brilliantly written. 
It is a classic scene of
upper-white-Christian-hypocrisy.

The main subject of the
conversation is basically about black people in society not knowing their place.  The
ladies talk on and on about being good Christians, and giving money for mission work in
other countries, and not complaining, and other 'what-would-Jesus-do' stuff... but the
core of the hypocrisy is in the underlying tone they all take that black people are not
equal to white people.  To summarize the attitude: They have a place.  That
place is beneathe us. And as a result of the trial they are getting
all "stirred up" and some white folks are encouraging it. 
Outrageous!

Another huge irony in this scene is
that the ladies are indirectly attacking Atticus and Scout doesn't even realize it.  The
best line is on p. 234 (in the paperback).  Scout is thinking to
herself:

"There was something about them that I
instinctively liked... they weren't - " when Mrs. Meriweather interrupts her thoughts
with:

'Hypocrites, Mrs. Perkins, born
hypocrites.'"

It is the perfect finish to the
sentence.