Another update. They drove a friend, Sally home. I offered for her to stay the night, but she wanted to go home. Son came to pick her up and honked the horn several times at 2 AM! I ran out and told him that is unacceptable and don't do it again. He was angry she was coming home so late and then made it known he did not like driving Sally home. This is the type of behaviour that makes me not want him at my events. As far as I can tell, his social skills have NOT improved in the slightest.
Sally told me when they got to her house, remember it is after 2 AM, Muffy asked to come in for a tour of the house! AT 2 AM!! Sally just wanted to get to bed, but was so flabbergasted by the request, she said yes.
The more I think of it, the more I think she likes to cross boundaries and is very presumptive!