When you have an autistic child, then you can be the "expert" and tell the rest of parents with autistic children how to parent. Until then, you need to refrain from making blanket "bad parenting" claims.
A stranger biting my child (not autistic) had better stay out of my reach, because when I get ahold of him he's gonna wish it was only my child's teeth causing his pain! It is NOT up to ANYONE to bite my child. I don't want their nasty germs on my child's skin. We have enough health problems without any that might be caused by a human bite. Do you know how nasty those are???
Not only that, but if a school/teacher has a problem with my child, they better be calling me to apply the discipline. I don't want my child being the last straw that broke the camel's back and bearing the brunt of a teacher's frustrating day. If my child needs disciplining, they can call me and wait the ten minutes it'll take for me to drive down there. (never fear, my child will NOT enjoy the experience)
You might call this liberal, I call good parenting and a good parent protects their child from the whims of people who don't have their best interest at heart.
Of course right now, my children's teacher can discipline to her heart's content.
Cause I AM my children's teacher.