Cecil Jacobs teases Scout because her father is defending a black man.
Your choice of the man vs. society conflict is a fitting one, since that is one of the most important conflicts in the books. Scout comments that Atticus has warned her not to fight, but she forgets and gets into a fight in the schoolyard.
Cecil Jacobs made me forget. He had announced in the schoolyard the day before that Scout Finch’s daddy defended niggers. I denied it, but told Jem. (chapter 9)
Chapter 9 is where the novel takes its initial turn, and we move from the carefree games of children to the reality of Tom Robinson’s trial.