I was at Taillevent in Paris and the (American) couple next to us ordered their wine. The sommolier suggested that they might not want the wind that they selected as it was a very particular wine. They (rudely) said that they wanted it, and disregarded his suggestion. When the wine came, they decided that they did not like it after all, and sent it back. The sommolier took it back, but the whole exchange was really ugly. I agree that you should not send a wine back unless the condition of the wine is poor. I agree with your take on the above story. The couple should have taken the sommelier's advice. That's what he's there for, after all. However, the flip side is that people are often intimidated by wine selection in restaurants. They will suffer through a bad bottle rather than say something to the sommelier or waiter (for fear of ridicule or being labeled "unsophisticated"). If you think a bottle is bad, you should [politely] say something to your server, even though this can be embarrassing.