I didn't hear anyone in the North singing that and I was there. Singing about the IRA is fair game in my opinion and that's exactly what I did. That arsehole was showing the crowd his lovely tattoo and then went to the official to complain about their reaction. It seems that sometimes you can have it all ways.
I have no religion but still wouldn't chant against something that symbolised a person's faith. Knowing the IRA and what they stand for, I will still chant against them when they return to Bloomfield Road, and Mr Clean.