A lot of people don't know how to respond to alcoholism in the family. Some of what you might be seeing now could be a cover for their own feelings of guilt and helplessness.
I can't blame them for not wanting to include him in family activities--as SparkleKitty noted, the alcoholism isn't gone just because booze isn't being served. I'm sorry you're feeling excluded, though. Sounds like it might be wise to work on building your own family of friends who support you.
Hugs,