Final answer:
Miles understands that The Colonel despises the wealthy due to his own past challenges. The Colonel has more to lose if expelled from school, and Miles feels a newfound appreciation for his family after returning from Culver Creek.
Step-by-step explanation:
When Miles spends Thanksgiving with The Colonel and his mother, he learns that the Colonel's disdain for the wealthy comes from a history of personal struggle and the challenge of overcoming poverty to achieve success, similar to the accounts of hardship faced by characters at the mercy of powerful figures in literature. The Colonel has worked hard for his achievements, making any potential expulsion from school a serious loss, as it would jeopardize his future prospects and the sacrifices he has made. Miles's emotional response after returning from Christmas reflects a deeper appreciation of family now that he has experienced life away from home; he realizes what he previously took for granted.