I live in Dublin right now. In general the normal rules of society dictate that its weird to talk about race and you're going to lose friends and acquaintances if you bring it up as a negative. Except against the travelling community (that's kind of an indigenous white people group, that's a whole other weird thing). Where you would run into trouble is there are a lot of people who are basically outside of society due to poverty and basically lack of an opportunity to be part of it. Wages have been down since 07/08 a lot and even before the neoliberal squeeze was on. On top of that there is near zero class consciousness in spite of much wider unionization than you see in the states. These people would have basically died if they lived in the states. And the kids of these essentially outsiders in their own country don't buy into social rules because why the fuck would they do nothing for them and specifically target them as worthless. That's where you're most likely to hear an N bomb and get punched. Its different to the American version of this in subtle ways that are hard to explain, like it seems much more likely to happen to someone who's visiting than some black guy who has obviously lived in Ireland his whole life. Even then its unlikely unless you go into bandit country. Where that starts and ends can be hard to tell though.