That's not entirely accurate, Chris. It's true that very few people in Ireland - although there are some - accept the diaspora's image of the famine as an intentional genocide. But nearly everybody accepts that the death rate was as high as it was because of Britain's utterly inadequate response to the blight. And most people would say that this response was due to a mixture of extreme laissez-faire ideology and some degree of diminished concern for the victims on account of them being Irish. It's also often said that the effects of the blight were severely exacerbated by the landlord-tenant system, which of course had been imposed by the British. So it's not just the diaspora blaming it on the Brits. It is, however, mainly the diaspora that seems to lie awake nights still thinking about the famine, and that is a source of annoyance to native Irish people, though not the only source.
Personally what irritates me about diaspora Irish is when they come here and complain about all the immigrants diluting [what they imagine to be] the traditional Irish culture - hello, you *want* this country to remain a third world shithole that nobody in their right mind would ever move to?