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Like stealth, I have an 8yr old who is tall for his age, mature, uses deodorant daily so definately an early maturer, he also has AS.
He has been very angry, grumpy, rude, shouty, lots of attutide etc and I found something that changed all that, reducing it to acceptable levels.
First I started praising every little tihng he did that was behaviour I wanted to see (talking nicely to us, interacting positively,. not shouting when asked something that could trigger a shout etc etc), we introduced reward tokens (with a lot of help from fellow MNers in the special needs section) and then last week I found a book in the library called Parenting yourt Defiant Child and oh my god it has completely changed how I interact with DS, and as a result he is never angry, even when he attempts to shout and get cross it is half hearted and he soon stops.
I know it is early days, but the changes have saved my relationship with him and started to really change his behaviour.
I'll go find the book and who wrote it if anyone is interested.