What provokes Scout's defiance of Aunt Alexandra? What is Atticus' response to this?

Scout opposes her aunt. She tells Aunt A. "I didn't ask you!" This ends with Atticus moving swiftly to make Scout apologize,

"For a big man, Atticus could get up and down from a chair faster

than anyone I ever knew. He was on his feet. "Apologize to your aunt,"

he said."