What is the significance of the cootie affair with Burris Ewell?

The cootie affair involving Burris Ewell in "To Kill a Mockingbird" highlights his poor hygiene and disrespectful behavior towards his teacher, Miss Caroline. It also reveals the social class divide and the lack of proper education and upbringing that many Ewell children face. By showcasing this incident, Harper Lee emphasizes the challenges faced by underprivileged families in Maycomb.