When Scout made that comment, she was showing how much she had matured. Throughout the novel, she had staunchly resisted her Aunt Alexandra's attempts to turn her into a well-bred Southern lady. However, whether she realized it or not, Scout was behaving like a lady as she insisted that Boo be her escort on the streets, rather than follow her. She is preserving Boo's dignity in the face of the townspeople who will undoubtedly be watching as he returns home; for all the gossip and idle chatter that will likely take place in Maycomb after the events of the evening, no one will be able to say that the little girl had to take the grown man home, so pitiful was he. Although Aunt Alexandra had tried hard to civilize Scout, it was probably Atticus's gentle, consistent lessons in tolerance and compassion for others that were the source of Scout's classy and mature-beyond-her-years behavior that evening.