Prejudice against Genders
“Scout, I’m telling you for the last time, shut your trap or go home - I declare to the lord you're gettin’ more like a girl every day”. This example from the book is telling you that Jem was getting frustrated with Scout.
Another quote related to gender prejudice, “What are you doing in those overalls?You should be in a dress and camisole, young lady!”
The technique used is connotation
These quotes are a demonstration of gender prejudice, Scout feeling bad about the way she dresses and the expectations of the way she should act. This all comes under the way she should behave in front of