"'So "The Rare Ould Mountain Dew" reminded him of his girlfriend did it Allan - WTF was she A Kentucky Moonshiner?? '"

Seriously if folks don't want it to be about Irish immigrants fair enough then let it not be about that for you. It could be about any couple from anywhere that is plain. Just as Dirty Old Town could be about anywhere - though we know it is written about Salford. There is enough in the lyric to surmise that TFONY involves immigrants in New York though. Even the line "they have cars big as bars" suggests they are relative strangers to the US with the stereotype we hold here of the Americans having huge cars. Then there is enough in the lyric and enough in the other songs of the band and enough in the title and history to suggest the immigrants are Irish rather than from Ipswich or somewhere. If you don't want them to be then fair enough!!! It isn't really worth fretting over though. If someone sees that Irishness for themselves in the lyric they will see that.