That's kind of the way I felt. It's like their concern for Kim's "alcohol problem" came out of nowhere (it's been alluded to, but they didn't send her to that recovery house). IMO, Christie (like any "addict" who can't partake in their addiction anymore), was more pissed off at the fact that she couldn't join in, and Kim's behavior put that harsh reality in her face. However, the mature thing would have been to deal with it instead of blaming Kim.
But that aspect was never discussed. Which is odd, 'cuz Christie's reaction would seem to be part of the process of letting go of your addiction, and dealing with the realities of the outside world. Does she expect everyone in her life to not drink around her just 'cuz she has "issues"?
Having said all that, do you agree that Christie even has a drinking problem? (from what we've been allowed to see!) All I ever heard about was some kind of twice-a-month binge-drinking episodes, whereas Kim talked about her and her husband imbibing on a regular basis.