It's a bit like making a joke about Israel/Palestine.
In Northern Ireland at least, you had state-sponsored terrorism by the police, IRA blowing up civilians, thousands killed - the very worst sectarianism imaginable. Some of this continued into the 90s so yes, the wounds are still fresh.
That doesn't even delve into the long, brutal history between Ireland and England spanning centuries, a relationship that's only healing today.
In Northern Ireland at least, you had state-sponsored terrorism by the police, IRA blowing up civilians, thousands killed - the very worst sectarianism imaginable. Some of this continued into the 90s so yes, the wounds are still fresh.
That doesn't even delve into the long, brutal history between Ireland and England spanning centuries, a relationship that's only healing today.
http://en.wikipedia.org/wiki/The_Troubles