Why would a child laugh while being aggressive/attacking parent during a severe temper tantrum? (7 y/o boy with aspergers)

Part of disorder: Part of the disorder is inappropriate emotional responses to situations.Laughter to a boy with asperger's is not the same laughter as you and i would interpret it. That it what is so hard for all of us to understand with these kids, because we interpret our environment and situations one way, and it's a totally different world and experience for these kids. Often altered sensations to pain as well.

Dysregulated: The likelihood is that he has a condition called dysregulation. As a result he is not in control of his emotions when he has a tantrum.