On words being offensive we once had a complaint when playing across the pond at a rather well known Canadian festival. The song in question was Waxies Dargle. The offending verse was the second:

Says my aul' wan to your aul' wan
"Will ye go to the Galway races?"
Says your aul' wan to my aul' wan,
"I'll hawk me aul' man's braces.
I went up to Capel Street
To the Jewish moneylenders
But he wouldn't give me a couple of bob
For the aul' man's red suspenders."

This Dublin song written sometime in the nineteenth century was a children's song and by the time we performed it had been in existence for over a hundred years at least. We told those who brought the complaint to us to basically eff-off and that we would not change the words of a song to suit political correctness, the song is "Traditional" and would only be performed by us in it's original form.