But I disagree that that makes it for snobs. Snobbery is more about an attitude of looking down on others or their tastes, whereas knowing Latin or being a fan of opera is really just about exposure.
Sure, there exist some (too many) opera fans who would say something like "it's real art compared to pop or hip hop being low class trash", but that's not a defining part of liking opera and plenty of people who like opera aren't snobs. Ironically it's a different form of snobbery (sometimes called reverse snobbery though personally I hate that term), to dismiss anyone who learned Latin or who likes opera as being a snob!
That's not really the concept. People know what an orca is.
But if you see a crossword clue that says "black and white animal", you know that the answer is ORCA without even needing to look at the number of letters in the answer. (Could it be "skunk"? Could it be "panda"? No, those are stupid questions.) Same thing if the clue is "marine predator". (Could that be "shark"? No.) The words I listed are incredibly likely to appear in crossword puzzles. That's what's weird about them.