This calls to mind something that annoyed me. I've been to Coppers (Harcourt St, Dublin) three times in the past year and each time I've been subjected to the Riverdance tune as the finale. On the first occasion there was the element of surprise and given I used to be a fine Irish dancer in my younger years, but probably more out of being drunk, meant I cavorted about the place. The other two times I swiftly departed for reasons of personal sanity, did that make me less Irish I wonder? Should I have stayed on to at least acknowledge the tune that has put Ireland on the world map of dances. A symbol of national culture and pride in our heritage that must be respected?
No. And I think we can extend this to Amhrán na bhFiann. The reason you heard it is because of a deluded DJ/band thinking the best manifestation of their nationalistic tendencies is to play the national anthem, taking it into their own hands to stoke the embers of smouldering Irishmen. If I was to take part in a rousing rendition of our anthem after a feed of pints I think, and not even being violent, I would feel the urge to hit someone. In other words it would only result in a reified/false exhibition of a feeling that is perpetually burning inside of me. Hopefully that makes sense.