In chapter 3, Scout criticizes Walter for pouring syrup on his plate when he comes over to the Finch house for a meal. As a result, Calpurnia makes Scout eat in the kitchen. She tells Scout it is rude to humiliate Walter in that way.
From her actions toward Walter in this chapter, the reader can infer that Scout is unable to look at situations from the perspectives of others different from herself. Scout takes it for granted that the way her family conducts meals is normal and sees herself as superior to Walter. She also does not consider Walter's feelings when criticizing him in front of everyone.
Her inability to understand Walter's table manners is an early example of her need for growth. It can also be perceived in her fear of Boo Radley and her naivete regarding Tom Robinson's plight. By the end of the story, Scout is better able to empathize with those who are different and to grant them the respect they deserve.