Here’s another link. If you want more, I’d simply google “Ireland hates Israel.” “Ireland hates Jews” works very nicely as well.
http://www.israelnationalnews.com/articles/article.aspx/12254#,USdpZtOXIU
While a lot of that is the organized left (the same people that protested against nukes and South Africa, etc.), it should not be surprising that a small formerly colonized people (the Irish) would side with a currently colonized people (the Palestinians). On Israel, it is America that is out of step with the World not Ireland. Americas one-sided sycophancy towards Israel probably looks as ridiculous to them as their ‘hatred’ looks to you.
The things Europe and much of the World dislikes about America are its: foreign policy (dominated by Israeli and Jewish interests) and its export of ‘democracy’ (actually multiculturalism - itself a very Jewish project, liberalism, feminism, and ‘gay rights’).
As to anti-Semitism: it is a silly phrase - no better than ‘Islamophobe’ - for anyone that dares question the actions or influence of Jews. Again makes sense that a small distinct ethnic group (the Irish) would be concerned about infiltration of their country by another distinct ethnic group (Jews). This is just like the way Israelis are rightly concerned with their demographics. What is the point of having your own country if it is not populated with or controlled by you. Indifference to demographics and belief in a ‘proposition nation’ is another strange American affliction.
As a note: Sadly the Irish, just like Americans, have allowed themselves to suffer population replacement via immigration. The Irish elite has adopted the Judeo-American values of ‘diversity’ and multiculturalism. So a fat lot of good its ‘anti-Semitism’ did.