The Irish are lovely and very friendly. When I was visiting Dublin there were zero issues. But you are right, it's important to know everything about the place you are going to visit, in order to avoid troubles. I can suggest a list of travel forums, maybe there you get to find all the answers https://travelsites.com/travel-forums/
I am British and lived in the Republic of Ireland for four years. I never met any hostility at all, just a warm welcome. The only thing I found was that very few Irish understood the difference between England and Britain. When I explained to people that I am Welsh, not English they would look at me as though I had announced I was from Mars.