"I guess you just don't care about...."

Goodness, is someone giving these kids a script to use? If so, I'd like to sign up to get my manual to neutralize them. DS is 9 and we've been hearing this alot lately. Something else we're dealing with is his lack of acceptance of the word "no" - it's as if he's never heard it before and he deems it an instant invitation to begin stating his case and making his arguments. It's driving us batty, especially when he acknowledges that (historically) he's been unsuccessful at getting us to change our minds using his tactics. We've also had to resort to clarifying that "maybe" and "I'll think about it" are not codespeak for "yes, but I'm waiting to tell you until I decide you've waited long enough"....