I agree with the responses you've gotten so far; this may have been a defensive reaction to a sensory issue.
Do note that K is a very difficult time for AS kids. There is more of "everything" now, and "everything" is overwhelming. While having more consistency will help mitigate that, it can't take the core of it away, and your son is going to feel the stress of it.
Keep the lines of communication open, keep your eyes open, look for the triggers, and work on mitigating them.
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Mom to an amazing young adult AS son, plus an also amazing non-AS daughter. Most likely part of the "Broader Autism Phenotype" (some traits).