What does Maudie mean by people with background?

Miss Maudie defines background as a quality in people who are rational and do not feel that "fair play is marked White Only" - meaning that justice must only be available to whites and not to blacks. She was steadfast in the notion that a person with "background" is a person with morally correct influences, who appreciate those who undertake great efforts to support their rational beliefs in times such as the 1930s in the Southern States where prejudice reached its peak. People with background appreciated the efforts of Atticus, who sacrificed social approval from the whites (except for those with background), persevered despite the various names and discouragements he was subjected to and utilized every tool possible to save his innocent black defendant. Those with background, seeing Atticus, who did what they themselves were too frightened to do, too unwilling to sacrifice, paid him the highest respects. Miss Maudie's definition of background points to the few people in Maycomb who were not prejudiced and followed the true Christian path of being egalitarian.