Ireland has long been anti-semitic, and pro-terrorist.
It was never this widespread in the past. It existed of course, but only among the political elite and fringe elements in the cities.
One man's terrorist is another man's freedom fighter. It's true that most if not all Irishman have little affinity for the British. The IRA was the result of hatred and resistance against British oppression and subjugation. History will tell you why. As far as Irishmen being antisemitic, on what do you base this opinion?