I don't believe for a minute that vaccines are responsible for autism, but any genetic disease or pre-disposition to disease, which is X-chromosome linked is more prevalent in boys (since they have only one, and if that one is "bad", there isn't another one to provide a compensating normal gene).
Thank you so much for this! I wondered about that and figured it was cephalopelvic disproportion during birthing -- and that certainly probably plays a part in the system jumping to intervention -- but your reasoning sounds correct.
Having said that, Stanford's study of families with more than one autistic is only indicating a weakness in (I think three) genes that causes a predisposition.