@MargaretBall
Just to correct you there DawnNative, the written constitution of Ireland states in clear English that "the name of the State is Éire, or, in the English language, Ireland". Doesn’t really matter how you double down on this, it’s there in black and white and has meaning and intent. There’s a long documented history of this but even a quick google on Wikipedia explains.There are official conventions /guides on how to address countries for a reason, it’s to avoid offence. Ireland is absolutely not unique in this - lots of other countries have complicated histories and relationships and what ‘shorthand’ you choose to call another country can be loaded with intent.
You're correcting me on nothing at all as your post bears little relevance to what I'm saying.
"Ireland" has always been used to convey a territorial claim over Northern Ireland from the DeValera Government onwards.
Yet there's a significant number of Irish Republicans who logically assert that the ROI is NOT Ireland because Ireland is the entire island. And the ROI is not the entire island. That's a logical argument.
Hence, most of us in Northern Ireland do not call the south "Ireland". We're NOT one country and calling it "Ireland" does make outsiders think they are.
Which has been the purpose of the south since DeValera. 
Much like how the majority of countries in the Americas do NOT like the US being referred to as America.
Most people do not use official names if states.
They use America for the United States even though its the United States that is the official name.
They use China even though People's Republic of China is the official name.
They use Taiwan even though the official name is Republic of China.
They use Australia even though Commonwealth of Australia is the official name.
The practice extends to contested areas too.