Always tricky going on a first date with someone who doesn’t drink. The best way to handle it is almost certainly not drink a bottle of champagne. If you read between the lines, though, it sounds like Sam needed it.
Poor Sam must have been so legless, he can’t remember what Victoria’s table manners were like, so he went for the traditional “impeccable”. Except he probably slurred it so it sounded more like “perble”.