It is offensive to all people of British descent that a Yemenite Arab is called a “Briton.”
It is probably offensive to the Yemenite, also. The confusion of geography with ethnicity, has been too carefully orchestrated to be purely accidental. It fits the pursuers of world government's efforts to pretend that people are interchangeable too nicely to be accidental. The way that the Left in Academia immediately adopts all changes in nomenclature, which point in such direction, clearly demonstrates that it is not accidental.
Note, when was the last time that you saw or heard a prominent Leftist ideologue refer to England or Great Britain as a "mother country."
Much of the youth is being systematically indoctrinated with the cloud-borne fantasies of the Left, and this word game is part of the pattern.
To understand what is really involved in the make-believe world of human interchangeability, and the direct threat to national sovereignty, see Surrender By Subterfuge.
We have been losing the fight for reality for over half a century.