OK, so I want you to follow this link HERE.
Now that you are back. I would love to hear any stories you have about this happening. Me being an unassuming sort, tend to not argue with the barkeep and just get a better beer.
But how does one go about getting bad beer off the tap? Do you tweet it? And if so, do you tweet that the beer is bad or just to beware that it was off tasting to you?
I would probably just inform the manager next if the barkeep does nothing and let the next level make the call.