This week, BWI to MHT. A lovely older couple were sitting near me. The older woman pulled out two tan coupons and asked for wine. The FA proceeded to tell them they were no good, the older woman said "how can that be, there's no exp date on them". FA went back at her and was somewhat rude. Debate ensued and the FA caved and gave them the wine. However, it was after a rather hostile exchange... The FA being the hostile one and the woman remaining calm.
After this all went down, the FA came back no less than 3 times to further discuss it. It was quite a scene and not good for business. It left a real bad taste in people's mouths surrounding the seats.
The FA was obviously under pressure to not accept him and I bet did not want to get into a debate over a few bucks in wine.
On a side note, I was flying BS and did not feel like drinking. As I do every time I fly BS and dont drink, I give my coupon to someone else to use. If the FA did not take the old folks coupon, I would have sprung for them.