In Chapter 3 of "To Kill a Mockingbird," Scout Finch has a challenging day at school. After getting into a fight with Walter Cunningham over lunch, Scout is disappointed when her teacher, Miss Caroline, doesn't understand the Cunningham family's situation and punishes her instead.
Scout's older brother, Jem, intervenes and invites Walter to their home for lunch. At the Finch household, Scout is initially unkind to Walter, particularly over his table manners. However, Calpurnia, the Finch family's cook, scolds Scout for her behavior and emphasizes the importance of treating guests with respect.
During lunch, the children discuss various topics, highlighting cultural differences and social class issues, particularly regarding the Cunningham family. Scout begins to learn about empathy and understanding when it comes to people's circumstances.
The chapter illustrates themes of social class, kindness, and the innocence of childhood as Scout navigates her growing awareness of morality and human behavior.