Developing Autistic Learned Behaviours comes from creating your own Subconscious Rules from observations you make from parental Learned Behaviours.

The key ingredients of parental Learned Behaviours are being grumpy/overbearing and obsessive neat freak/control freak type actions. The way a young child tries to makes sense of this is to create Subconscious Rules and in the case of Autism, two Rules are:
Everything must be done in a certain order every time.
People are scary.

The child then develops Learned Behaviours to support its new Rules. More of the parents regimented ways of doing everything and social disengagement. It is unlikely parents change the way they do things which continually reinforces the child’s Rules. The more noticeable part of Autism is the child’s Reactions when somebody breaks one of the its Rules like making even a small change to one of its learned routines.
History repeats itself.