It seems they are not ready to acknowledge their own alcoholism and probably feel treatened by your change. I think the only thing you can do is take some (emotional) distance and not to expect any support in your new lifestyle. As time goes on you will find healthier relationships, but the most important thing is that you will have a healthy relationship with yourself.
It is extremely sad that it´s your own parents who maintain these disfunctional dynamics but at some point we have to accept that parents are just other human beings and that we cannot change them into who we would want them to be. And that is ultimately a good thing, because we are perfectly capable of taking care of ourselves.
I think this forum is right for you, the things we have to learn as friends & family of alcoholics (like detaching, focusing on ourselves) are what you will be dealing with with your FOO now that you´ve chosen a different path for yourself.