In a city renowned for its bitter sectarian divide, it can’t be a good idea for the Scottish TUC to urge Celtic fans to wave Palestinian flags at their team’s match with Israeli team Hapoel Tel Aviv. Surely this falls foul of Celtic’s own code of conduct, which states supporters at the ground would be guilty of “disorderly conduct” if they stir up “hatred or ill-will towards individuals or groups of people” because of “national origin”.