This is a stupid move on the part of Spain. Their economy is in the tank and they really need all of the help that they could possibly get. They really can’t afford to poke Great Britain in the eye and yet they are doing it. Dumb.
“This is a stupid move on the part of Spain...” Agreed.
Spain, though, has a greater claim to Gibraltar than Argentina has to the Falkland Islands. Gibraltar was once part of Spain, whereas the Falkland Islands were a colony of Great Britain before the nation of Argentina even existed!
The Falkland Islands lay outside the 200 mile offshore limits, so Argentina cannot claim the islands based on that, plus the inhabitants of the islands believe themselves to be Brits and not Argentines.