Calpurnia means just because Scout's family might be better off, wealth and class wise, than the Cunninghams Scout cannot go around treating them as if she is above them or has a higher rank. Calpurnia is correct and is trying the kids perspective of the Cunningham's point of view and adding her experience to back up her lesson, with emotion, since the kids visit a colored Church ever so often.
The direct object in a sentence is always a thing or a person who received the action of the verb. That means that the direct object would be the grandmother's room.
