Here's what I would do.
I would set up an activity and tell everyone beforehand what your expectations about behavior are. IF he breaks one of those rules, he is removed from the activity. He is set up with activity of YOUR choosing (it could be silent reading, coloring alone, etc)
Rinse and repeat.
The disrespect is deplorable. My 9yo talked back to me in the car last night and I banned him from talking at all. "If you can't use polite words you get to use NO words."
