Anyone who gets surprised when they find out someone has never been skiing.
That depends on culture a lot. In Austria it's actually rare to find someone who has never been skiing (25% of the population go skiing regularly, and that has already been at around 50% not many years ago). Even when not doing it with your family while growing up everyone learns it at school.
I'm not rich at all but I do get surprised when someone who isn't obviously from another country has never been skiing (typically it means that they grew up somewhere else but you just don't notice anymore).