For the past year or so everything my A and I have done as "time together" has incorporated beer somewhere. (off the top of my head I'm thinking bowling,finding a bar in the middle of a shopping day in a shopping mall, he even had to stop off for a beer whilst we were in the line for a ride at disney) I think I have just came to accept "the point at which he gets drunk" as a part of every social thing we do.
I'm really sorry your date night was ruined but , for what its worth, sharing it here has really helped me in forming another boundary.