My 9 yr old Aspergers son is getting very lippy

[mrsforgetful]

He's not quite 10 but reminds me of harry enfields ' kevin'.(pleeeeeease don't say he's an adolescent yet!)At the moment, every time i say anything to him he answers back either in a silly voice,snaps my head off,rudely reminds me that he is busy etc...however when he wants to talk about 'digimon' (his 'latest' subject) then i am expected to be the perfect audience- its like he's too big for his boots!Then 5 mins later he obviously forgets his rudeness (because ofcourse he doesn't see that he's been rude..!>>