What do Jem and Scout fight about? What does Harper Lee do to show the reader that Scout still looks up to and respects her brother, even after they’ve fought?

Jem comment ignites Scout's anger because she is sick of Jem acting superior.

Explanation:

Jem, who is four years older, has been speaking to Scout in a didactic tone as of late, instead of his typical friendly manner. When Jem threatens to spank Scout, she grabs his hair and punches him in the face, and fighting ensues.

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