The British really disliked the Irish stance in WW2 and after they decided to join after Pearl Harbour so did the US, and after the Soviets started the war on the Third Reich's side & carved up Poland with them and were then betrayed by the Nazi's so did the USSR become quite critical of Ireland. I guess you could argue the US was already helping Britain economically, and the Soviets letting and helping the Nazi's carve Poland, is not a million miles away from Britain letting Hitler take a good chunk of Czechoslovakia, and then all of it.
Why were these countries much more hostile to Irelands neutrality than say Belgium's, Holland's, Greece's, Yugoslavia's, or for example Turkey, who changed their position in the last 2 months of the war, which to me seems much more dishonourable & opportunistic, and they weren't the only ones who jumped in at the last-minute. Spain & Portugal also stayed neutral which certainly in the case of Spain was a good thing, as Germany providing the Condor Legion's air power & Italy sending 80,000 Italian Fascist Volunteers to aid Franco in the Spanish Civil War and the Soviets sending arms to the Republicans (mainly Communist militia's and only Marx-Leninist ones at that) it's safe to say had they entered it would be on the Axis side, in 1941 they provided Germany with the name of 6,000 Jews in Spain, but the clearer it became who was going to win Spain let Jewish families cross the French border to escape the SS.