What is the conflict between the grandmother and the Misfit in "A Good Man is Hard to Find"?

As a Roman
Catholic,was often concerned with the cardinal sins, especially that of pride in her stories. 
In "A Good Man is Hard to Find," the grandmother prides herself upon being a lady and
a moral one at that.  Hints of the conflict between her and the Misfit appear early in the story
when the grandmother takes such care in her dress for the road trip.  She contemplates what a
person would perceive if the family has an accident on the way.  With dramaticO'Connor
writes,

In case of an accident, anyone seeing her dead on
the highway would know at once that she is a lady.

If
she is killed in an accident, it will little matter what she looks like, yet she is worried
about physical appearance and what class people will put her in based upon this appearance. 
Later in the story, the grandmother tells her grandchildren that she should have married a Mr.
Teagarden since he was a "gentleman," and had died a wealthy man.  Again the
grandmother's emphasis upon class...