My child has autism and severe learning disability, has also never once pushed, hit, kicked, bitten etc another person.
Mine aren’t aggressive either and have never hurt anyone other than accidentally (one broke my nose while jumping up and down, complete accident).
However, I know about mum with a child with ASD the same age who has started biting other children. She’s not a worse parent than me, it’s just how things have progressed for her child. I’m lucky that my two, both of whom have oral sensory seeking compulsion, prefer to chew on objects than bite people. It’s nothing I’ve done to create that difference.
The only criticism you can pass is knowing that your child is aggressive and leaving them unsupervised when that’s not necessary (eg i can’t be constantly on top of both twins at the same time so there are times I have to let one continue jumping off furniture because the other needs changing or immediate attention). I wouldn’t do that whether my children were aggressive or not because I worry about their safety and the safety of others.
But you can’t criticise a parent because their child’s ASD-related behaviours are more aggressive than yours. I thank my lucky stars that mine aren’t aggressive (yet) because I have no clue how I would manage
I also know how absolutely awful if it is to be doing something bog standard for your child’s age and have everyone staring at you because your child is behaving differently. It’s really really upsetting.
That doesn’t mean the parent in this situation acted appropriately, however.