The whole premise of the joke is the relative "common knowledge" of Nicaragua, or any other central/south American country. Be it to Americans or Europeans

Im not competing with any other commenter, or anyone else. It's just a fuckin life experience.

Don't make jokes if you can't take jokes

Edit further if living in the UK for a decade across the "formative" years where geography is taught doesn't count, then I'm not sure where the lesson about countries lands.