Ditto -- I open one bottle when some folks are visiting, and other bottles for a different group. When we open champagne for my wife's birthday, I pour most people 1/3 glass, and my b-in-l gets a splash. He doesn't care for champagne and will drink a sip to be sociable, then he opens a beer. He's not offended (he appreciates the small glass), and there is no point in wasting it.
OTOH, when my sons are home, I send one into the cellar for a bottle, I
know they'll bring up one of my best, and I save those bottles for the family/friends who have the palate to appreciate it. Others get the cheaper stuff, and they don't know the difference -- not that they're getting poor wine, as I don't have any in the house.
The flip side to my niece story is an old friend who learned to drink reds when we roomed together, but he never developed the taste. His preference has always been sweeter wine, although he developed an appreciation for better quality wines.