Hello, your son sounds so much like my youngest brother, he also has aspergers & is gifted. My brother has always done everything in his own way & his own time, when he was younger he also had a disdain for his teachers & a destructive attitude. He was lucky enough to be privately educated since he was 3 with heads who were highly supportive & wanted 'characters' in the classroom (and character they got!!) The bit about the poisons is eery, I think it must come from a book or something as that was completely my brothers sense of humour and if he was in a destructive mood that is how he would have behaved in what he would have perceived as a pressurised situation.
The way he got through school was by being bribed each year that if he got good enough results he could have games consoles / it equipment / cash, it's amazing how suddenly focused he would become. His secondary school also bent the rules for him, my Mum fed up with his pestering for sports sick notes wrote him a note covering the entire year, for the next 4 years he was quietly allowed to not do any sports which relieved a lot of pressure from him & made him a lot less stressed. They also allowed him to use a laptop in class when the rest of the class were writing.
He was tested for dyslexia & found to have some aspects of dyslexia most notably an inability to structure text. This explained why he would fail exams which should have been easy for him, he always finished exams long before the other children, complaining that it was easy & he was bored only to then fail the exam. He also had problems with misreading questions because of the aspergers, he seemed to have his own interpretation of the questions. His lack of coordination also made it hard for him to write properly, which all added up to a lot of frustration & anger.
We found out recently that he has a very strong sense of empathy and understanding of others - this was a huge shock - it seems he just has no way to express it. We only realised this through his studying english literature at school.
Thought you may like to know that he is now happily at a top university studying a specialised science. He has been able to meet lots of others just like him, spending all his spare time having in depth discussions with friends & online about anything and everything. The university he is at has brought him down to earth as he is surrounded by people who have achieved more & suddenly he is competitive about other things like art allowing him to push himself in ways he had never imagined.
He also has a girlfriend and a flat which is such a relief & no-one would ever have dared to predict. He has mostly outgrown his aspergers, although he still has some aspergers quirks and is still fairly full on - he does not do light conversation!
He now also can laugh at himself, he enjoys programmes like 'big bang theory' and 'IT crowd' and we've always fondly teased him about his eccentricities which I'm sure has helped.
I hope this has helped, looking back the teenage fears of getting an education, partner & career are scary but all that is intensified if you have aspergers and feel like no-one will ever be your friend or fancy you. My brother has turned into such a lovely adult, everyone quickly warms to him for being the individual he is & he has accepted that in some ways he needs to adjust to the world because his one boy fight against the world was pretty pointless. :)