Take a random word. The proportion of people who know its etymology will be low. Is that really news to you? This is Hacker News, not Linguist News.
I don't really understand this attitude. I once made a joke about the Swedish word for sandwich - which is literally "butter goose" - and a humorless immigrant got all pissy about how Swedes are so ignorant, they don't even know that "butter goose" doesn't refer to actual geese etc etc. (Coincidentally, I did know the etymology but knowing it would not detract from the joke.)
I don't really understand this attitude. I once made a joke about the Swedish word for sandwich - which is literally "butter goose" - and a humorless immigrant got all pissy about how Swedes are so ignorant, they don't even know that "butter goose" doesn't refer to actual geese etc etc. (Coincidentally, I did know the etymology but knowing it would not detract from the joke.)