What has Jem learned about the divisions in Maycomb's society that Scout has not yet learned?

Jem has learned that the divisions in Maycomb's society are deep-rooted and based on racial prejudice, while Scout is still naive about the extent of racism in their community. Jem has witnessed firsthand the injustice and discrimination faced by African Americans in Maycomb, leading him to question the fairness of the town's social structure more than Scout.