sowornout thanks for your post. You are right that this is not a situation of unconditional love. I am very fond of DN and I'm sure he knows I am on his side and I'm fairly confident that what he feels about this situation will be based on everything that happens at home rather than the events and words of any one evening. There has been a change in his behaviour though, he has stopped saying please and thank you and generally strutting around like god's gift. Here echobitch is right, that we all go through a phase of thinking we are it and everyone else should listen up.
I had to be the 'mother' of a teen very suddenly, the same year I became a mother (although I am an older mother) and it turns out I am quite a strict one - I don't want to be spoken to horribly by anyone and I don't want DS to hear anyone speak to his mother like that. DN has done very well in many different ways - he is completely and utterly unrecognisable - but he is still very rude if he doesn't get his own way. While I appreciate this is 'normal teenage behaviour' - I personally am not going to take it. I think it's important in life to be able to button it when you have to.
At the moment it is a bit like being stuck in a loveless relationship you're not allowed to leave.
This evening when I told him off, for something that actually quite turned my stomach (piss-soaked guinea pig blankets left in the laundry room for me with all the clean stuff) he was completely dismissive and looked at me like I was an idiot while he said sorry then shut the door in my face, saying of eff off while I was talking.
I have high standards and I want him to know I think he can live up to them (not like granny who just goes easy on the poor little orphan boy) and I think this is important for his self-esteem.
nedelamer thanks, it's really good to know someone remembers my story from the beginning - MN has seen me through A LOT.
DP seems a lost cause on this front though although the meeting with the therapist was organised by me (of course, who else!) mainly to have a forum to voice my feelings on this front. We'll see if that gets through to him. I'm not sure if I'm taking out my resentment towards him on DN, I will have to navel gaze a bit on that score.
I must also say that he very much does know we agreed to take him in. It is definitely his choice to live here with us and I'm not sure trying to be his mother is necessarily the right road to go down.
Anyway, up at this hour fretting about the whole thing and DS has taken to waking at 5.30 these days.