We were discussing Spain & democracy, not geography.
The closeness of Gibraltar to Spain is hardly a valid argument that Spain can use while they retain their enclaves in Morocco.
As I pointed out, the Gibraltarians wish to keep things as they are, as do the Falkland islanders.
If you must bring in Ireland, it appears to be a fairly widely accepted state of affairs at present. But you fail to make clear whether you are talking about the Republic of Ireland, Northern Ireland, or the complete island of Ireland.

Our overseas territories may not have been obtained by diplomacy, but they are retained by such. If the Falkland islanders had voted to become part of Argentina I am sure that wish would have been accepted by the UK.
Argentina has no historic claim to the Falklands. (apart from a few days under their control in 1982)