The story about the instant coffee for the tradesman reminded me of an instance when I was younger.
When I was a student nurse in the RAF some of the sisters came from wealthy backgrounds and considered us as ‘below the salt’. One Christmas another student and I were offered a glass of sherry for a ‘treat’. The sister asked us if we had had sherry before, assuming our families were too poor to have it at home. My friend, the other student, looked at the bottle and said, “Yes, Ma-am, but, but never South African. We always have Spanish at home”