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Can you explain this joke? I don't get it.

There is a drink called "Cuba Libre" (White Rum + Coke).

Traditionally, Cuba libre also has lime juice while a plain "rum and Coke" order leaves it out. https://iba-world.com/cuba-libre/

Wikipedia suggests only a few sources draw that distinction and including lime or lime juice in a "rum and Coke" is very normal.

I've had rum and coke with lime but I've never seen something without the lime referred to as Cuba Libre.

That said, I have never been to Cuba, so what do I know?