Ugh! I dislike Megan and those scenes between Don and Joan just made my dislike grow. I don't really want Don and Joan to go beyond what they are. Those scenes last night were plenty hot! That chemistry!!
I also believe that Don was right in his first reaction to Megan. She does seem to use her rage as a bit of play before heading to the bedroom. I also thought her reaction was ridiculous. Sure, Don needs to be told/put in place, but there are better ways to do it.