Having Autism does not give you the right to mistreat other

Just because your child has autism does not give you or the child the right to be nasty to others, manners can be taught.  Today while we were out we went swimming and had a cook out with family and some friends.  It's no secret that a certain person hates us but we are not sure why she hates us, we have a few theories though.  Her son has autism and is very mean to David every time we see them, he is also very mean to Jack and another of his younger cousins, we keep Max away from he because we are not sure what he is capable of.  He has kicked Jack and David each in their faces before and repeatedly hits on them and when David lashes out and yells at him at the top of his lungs everyone blames David and never believes that the other child started it.  They tell us it's because he has autism, but that is not an excuse because David and myself both have Aspergers, and last I checked that is on the Autism spectrum but we don't go around hitting everyone we see.  Neither of us like to be touched and David understands that this other child has autism and knows how he acts, and knows that he only touches him to get a reaction out of him therefore he will try to stay as far away as possible from that child.  Until recently when grandma and grandpa witnessed the other child kick David and Jack in the face, apologize, then punch them again right after apologizing everyone thought that David was just being over dramatic on the situations, and another family member at another event had to yell at the other child to make him stop hitting the three younger kids the child said that David started it and the other person said that he witnessed the whole thing and David was just sitting down reading a book when the child came over and punched him.  You would think this whole time that the child's mother would notice that her child is the problem and not David except for the fact that she would rather not pay any attention to him and only intervenes when she hears David yelling at him to stop doing something.  Of course she doesn't see what led up to David's outburst she just thinks that David likes to yell at her child and not play with him because "David is a brat."  She insists on telling David that her child has autism.  David does not talk back to her, instead he comes to us and says "Doesn't she realize that I have Aspergers, I don't act like that."  Anyhow as I was talking earlier about the cookout David was swimming and so was the other child and David asked grandpa if he could take out the paddle boat so grandpa said sure, go ahead.  The other child asked too but his mother said "No, you're not going" and when that child said "Wait up David"  David told him "No, you can't come you're mom said no and I'm trying to get away from you."  The child's mother at that point decided to take her son and said come on.  While standing about a foot behind me her son asked "Was I being bad?" and she lied and told him "No, we are leaving because David is being a brat and I can't stand it."  I acted as though I didn't hear anything because I didn't feel like making a scene in front of everyone although I felt like telling her that I have Aspergers, I'm not deaf.  I also felt like telling her that David also has autism but we take him places with us and try to get him involved in team sports and socializing with other children and take him to the store and restaurants and parties with us rather than find a baby sitter because we don't want to deal with him and therefore he somewhat knows how to act in public, he might not say the right things and he can't control his volume too well but he has friends as a result of us taking him out and teaching him manners.  Autism does not give your child the right to be mean, many people that I know with severe autism and others with Aspergers are very polite because they are taught how to act.  They will not learn how to act in public if they are not taken in public.