In my experience, the United States and England (not the entire UK) have the thinnest skin and some people will straight-up tell you to f-off home on the slightest criticism, especially on the subject of human rights or the expeditionary wars.
There are of course the usual suspects, the racists and "Pro-Irish" crowd, who will blame everything on immigrants and accept no criticism of their imagined Ireland, but this isn't true in general.
However, if you make grand pronouncements from a position of profound ignorance and overtly judge the life choices of your new compatriots - a speciality of the GP - you will find yourself alienated at best. This is true everywhere, not just Ireland.