Dear Drink Geek,
I ordered an expensive glass of wine at a bar the other day, and what I was served tasted like cheap, "corked" Cabernet. (Not that there's anything wrong with Cabernet in general, it's just not what I ordered.) I didn't say anything because I was there with friends and didn't want to be "that guy." Is there proper etiquette for bringing up this issue with the bartender or server that doesn't sound snobby?
Tsk, tsk. In a situation like this you have to be "that guy." You're paying for a product. This is your glass of wine (correction: this is your expensive glass of wine), you should be getting what you want. Period. As for not wanting to sound snobby — it's a non-issue. Be polite, of course, this is not a table-flipping offense. As long as you're sincere and certain about your concern regarding the quality of the wine, addressing the issue should not be misconstrued as obnoxious.
Now, this does raise the matter of accountability on your part. If you're going to reject a wine for being "bad," be sure of your convictions — or at least have an idea what you're talking about. It helps to be familiar with the characteristic red flags of "corked" or oxidized wine. Have the server taste the defective glass or bottle (they won't take it personally), any professional worth their salt will be honest about finding a fault in the wine if there is one. It happens — after all, wine is a living, ever-evolving product.