Scout tells the teacher that Walter is poor and the poor don't take money because it show disrespect and the teacher hit scout in the hand with a ruler because that is not what she believes in in her perspective
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The Cunningham's are a poor family in the novel in relation to money. So, when the teacher was questioning Walter, Scout was informing the teacher that he doesn't exactly know any better and that is why he is in the condition he is wearing no shoes. Simply because, he is a Cunningham.
comes from a poor family and may not have money for lunch, so he's not refusing the lunch for any other reason. She suggests that the teacher shouldn't take it personally if Walter refuses.