The problem at RWS is not limited to adults in their early 20's. On a somewhat related note, I've been to 7 or 8 different NFL stadiums to see the Bills play, and the experience for opposing fans at RWS is by far the worst I've seen. It all revolves around the excessive tailgating, and people getting liquored up before they ever enter the stadium.
PS While I enjoy a few beverages of choice before the game, I have never been "piss drunk" at RWS, and my visits go back to the stadium opening. I am pretty sure I am in the majority and not the minority in that regard.