I have to say I can see where someone could find "Come all ye Black and Tans" offensive. It is quite insulting to the English. I see the historical perspective and perhaps the tendency to want to demonize the enemy to prepare to fight. I can also see that it may not be the best sentiment to project toward a current friendly neighbour.

I think those Irish Tourists were right. "Come all ye Balck and Tans" is not a polite song. Not so much I think because of the politics but because the language is rude and insulting.