It really sounds like 6-year old behavior to me. At that age, social pressure starts to become real & they start to push at their boundaries a little bit more to see how far they can stretch them. School starts to get 'real' in terms of academics & sensitive kiddos feel that added stress. I agree that he probably didn't necessarily understand what 'charging to his account' even meant.
Yes, there's a possibility it's more about a grab for attention. My niece went through the worst, longest phase around that age of not caring whether she got positive or negative attention from adults.... just so long as she got any at all. She really wanted attention from her AF, but short of that she'd take whatever she could get to replace it. Does he act out in other ways & this is just one example of many different kinds of bad behavior? If not, I'd chalk it up to growing pains.
