Consider this comment:
Quality of service at restaurants is dropping, and I don't think it's the servers' fault, I think it's the fault of management for cutting back on staff.
Several times now out with friends after work my beer's gone dry, and rather than cutting the server's tip, I go to the manager afterwards and pressure to get compensation for the terrible service. Since they can't give away alcohol, they give gift cards good for food only; fair enough.
What does it mean when the poster describes his beer has gone dry?