If you want to call yourself a wine bar - you need to respect the grape!!!
I was in and ordered a glass of prosecco to get things started and I was delivered a glass of warm, flat, oxidized horror in a cup. I was looking at it with dismay when a server came and swooped it out of my hands and said - oh is it flat? (Obviously!) I will get you another glass.
Now wouldn't you think the person pouring that original glass in a WINE bar would notice it was warm, flat and stale?