@johl good points. Never thought about the colonizer's language aspect, thank you for pointing this out!
That said, it would be remiss of me not to take this opportunity to reference a classic:
Choose language:
🔲 🇬🇧 English (traditional)
🔲 🇺🇸 English (simplified)
(I apologize)
@seachaint I bumped into a chap on G+ one time who was absolutely insistant that Ireland was not part of the British Isles, and that using that term was an offence against all Irish.
That ... isn't a well-supported case (there are numerous references to BI among Irish sources, and none that I could find clearly articulating an alternative) but it does reflect how contentious language and symbols can be.
There are certainly numerous other instances (as this thread is highlighting).
@dredmorbius @rysiek @johl A thing is called whatever it is called, but Ireland already has a name (several, actually, there's mythology about that whole mess), and "British" has evolved into a national identity and not merely the name for a set of geographical features. So, referring to Ireland as part of the "British Isles" has had evolved connotations and sensitivities. Referring to Ireland as Ireland is only liable to offend a small number of people, who you'll doubtless offend some other way anyway. But implying that we are British is likely to offend many more. :)
@seachaint And apparently the Irish proscription against "British Isles" is in fact official:
https://web.archive.org/web/20121006211200/http://www.oireachtas-debates.gov.ie/D/0606/D.0606.200509280360.html
(Via Wikipedia)