What does Jem say to Scout to keep her playing the "Boo Radley Game" in chapter 4?

The children invented the "Boo Radley Game," which was a dramatization of the Radley family rumors. Scout, Jem, and Dill played this game on summer days. One day, Atticus observed them playing. He questioned what the game was all about. It was clear he was suspicious. He told them he hoped their game had nothing to do with the Radley family. This was not a direct order, so Jem encouraged them to continue playing after...

The children invented the "Boo Radley Game," which was a dramatization of the Radley family rumors. Scout, Jem, and Dill played this game on summer days. One day, Atticus observed them playing. He questioned what the game was all about. It was clear he was suspicious. He told them he hoped their game had nothing to do with the Radley family. This was not a direct order, so Jem encouraged them to continue playing after Atticus left. Scout was hesitant to play after what their father had said.

Jem was determined that they should play the game. Scout continued to express her doubts about them playing the game, but Jem was forceful with his response:

I was not so sure, but Jem told me I was being a girl, that girls always imagined things, that's why other people hated them so, and if I started behaving like one I could just go off and find some to play with.

Jem associated Scout's desire to obey her father's wishes with the fact that she was a girl. Despite Jem's negativity, Scout was firm. She refused to play anymore.