K.B.
Hi S.-
I have a 6 year old with mild autism and while I have not dealt with anyone close to me or my son being unkind I have received the looks in the stores and the restaurants when my son is doing something inappropriate. You know the look that says, "can't you just tell him to stop?". The one thing that I have learned is that unless it's someone who has a special needs child or works with them they cannot understand what it is like. While they probably do not intend to be mean, they probably or wondering something to the effect of "why don't they teach him proper manners and rules about handshaking?" They just don't understand how difficult social situations can be for individuals with autism or how important habits and routines are in the individual's life.
You know these people better than I do, so you can decide whether this is something that would work with them and your son for that matter. But why not make this into a learning opportunity for your son? Talk to the couple and explain the issues your son has with social situations. Tell them that you would like to start teaching him more about proper etiquette in this area and proper personal space. Make sure they understand how difficult this will be, but perhaps they are willing to be a participant on Sunday. This will allow you to educate them about autism and also show them that you are working with your son in these areas but that it takes time and effort.
Best of luck with everything,
K.