Why does Jem think his eight-year-old sister Scout should start acting like a lady? Use quotes, and page and chapter numbers to support your answer! :)

Jem is maturing into a young man. The pain of puberty is making him moody and different. He is trying to distance himself from the childish Jem.

" I swear, Scout, sometimes you act so much like a girl (instead of a lady) it's mortifyin'. "