How does Lee use humor to show that she does not approve of using family heritage as a way to judge people? How is this significant to the character of Aunt Alexandra?

Aunt Alexandra's views typify the general consensus of traditional assumptions held by the Maycomb community. She introduces the idea of "Fine Folks" to Scout, who will be forever perplexed about what criteria are used to determine whether or not a family fits this category. There is a lot of dry humour, sarcasm and wit in Scout's narration about this. Aunt Alexandra truly feels she is setting an example that Scout and Jem need. Although she comes across as the status quo of Maycomb elitism and bigotry, her heart is actually in the right place.