Oh how very much like my son this behaviour is. My son also tried to use the "birth family" ruse but not often because in his case his birth family was abusive and addicted also.
You did well, and personally, if I was treated like that, I wouldn't go back for another visit. My son didn't treat me with respect until that was the only behaviour I would accept.
He's only in week one. Week two is often when they want to leave...then you get the stories about how bad the place is. After that, if they stay and make it that far, things tend to get better I think.
I'm glad you have found your own meeting. I really hope meetings help you as much as they helped me and many others here.
Hugs