Why is Jem more concerned with Atticus safety than Scout in the book to kill a mockingbird?

Jem equally cares for his father and his sister. He just feels more self conscious when other people and kids calls his father bad names because he is defending a colored folk. So that is why he cares a lot for his father. But that doesn't mean that Scout is worthless to him. He stands up for her in many places in the book such as when she is getting teased, stands up to Mrs. Dubose when she calls Scout ugly names, and even advices her to the right path.

He cares about Scout because he doesn't want her to act too bossy and wants her to act nicely to others instead of spoiled girls. That is why he said she was acting like a girl and it was a bad thing. It is not a bad thing for Scout to pick up ladylike manners, but it is not okay for her to pick up bossy traits that could ruin her image of personalities.