I've said before in other threads on this forum that despite the reputation the southern U.S. has for being a bunch of racists, I never heard the amount of racist language when I lived in South Carolina than I did growing up in Boston. Those blue collar union Irish Massholes are some of the biggest bigots you'll ever come across.
The same can be said of the Irish wherever they're found, I'm afraid. The only explanation I can think of is that their deep sense of inferiority compared to their English neighbours has manifested itself in bigotry towards others as a means of compensating for their cultural inferiority complex. That, and they're prone to drinking massive amounts of cabbage vodka, which is bound to bring their frustration to the fore. The Saxon has always held tthe whip over the Irish. Let's hope that responsibility is never threatened.