Can only speak from my own personal experience. A lot of Northern nationalists confuse the views of e.g. the Eoghan Harrises and the Sindo of this country with the wider view of the North held by Southerners. I spend a fair bit of time in the South (mostly in the border counties I admit) but also in Dublin. I've only experienced "anti-northern" sentiments directly once. Yes some people are a bit ignorant of what the North is like but I generally find that this is not reflected in "anti-northerness". Maybe people in the South don't think about a United Ireland every day but who does?