My son is 7 and a Aspie. He has been self advocating to the best of his abilities for about a year. He can tell friends what TV and Video games cause a sensory overload for him. As well as other little quirks. This child may be able to do the same and your child may be able to help him work through issues if they hang out and spend time with each other. Things like turning off a video game or show if it is bothering the child, ignoring quirky movements and hands over ears if it happens. Etc.. Maybe encourage the child with Autism to speak up and tell someone if something is bothering them while they are hanging out. Not make a big deal over any anxious behaviour,movements, or sensory overload. These kinds of things really make a difference when my Aspie in social settings.