I strongly disagree. I lived in Ireland for about 15 years. I have lots of Irish family. (My Irish mother still lives in Dublin along with my two brothers)
The idea that the majority of Irish people have no problem with the British is something I really can't get my head around. I would say the vast majority of Irish people have an issue on some level with the British. When they say the British they really mean the English as they don't have any problems with the Scots.
While the majority can suppress any ill feeling on a day to day basis, it is amazing how much will come to the fore after a few drinks. Even among my Irish friends in Ireland, the addition of a few drinks and the right stimulus can cause all sort of resentment to bubble to the surface. It is amazing how many even tempered types will after a few beers join in happily singing "Ooh ah, up the 'Ra"