Ok so I texted my bf about 3 hours ago , and he didn't text back , until well .. 3 hours later of course , and he said "sorry ,
I was at the movies" . And then I said "why couldn't you tell me that?" And he was like "I forgot to beforehand" .. yet he never tells me if he's about to do smth so tht was a lie , but anyways , I said "oh okay" and he replied "I didn't think it'd be a big deal" .... omg someone pls give me a sarcastic response to that 
This changes when Atticus shoots the mad dog. They find out that he is a sharp shooter and was infamous in the county as one-shot Finch. They were now proud of their father. Jem is confused that his father has kept this a secret and at first wants to know why Atticus would not be proud and brag about this ability.
The reason Jem won't allow Scout to brag about Atticus's talent is because he wants to be a gentleman like his father and understands that having the ability to shoot beings is not something to take pride in.