Unless you're from Clydeside or Merseyside, you will have difficulty understanding how ingrained is Irish politics in these areas.
On Clydeside, the separation of RC and Protestant schools acerbates the situation and is, IMHO, absolutely crazy.
Not everyone is a religious and/or political bigot: I noticed a lady commentator in one of those reports who is a Catholic Rangers supporter and my BiL is a Prod Celtic supporter. He did say, about blazer buttons which I hadn't even noticed: "I wouldn't walk past Parkhead (Celtic, Celts, Tims) wearing that!" Turned out that the offending buttons looked a bit like the Rangers (Gers, Huns) badge.