"Nice enough VOICE, but she's a CHEEKY one. Pushing her LUCK...."
It's what the "that" in "Nuts to THAT" is. He's dismissing his impulse to whack her and shut her up by reminding himself that she has the right to be uppity if she pleases. After all, Jefferson says so! And he was a Manly Man as well. I think he wrestled bears bare-chested.