The problem may be you perceiving it as a superiority complex. If a Celtic fan was going to watch Barca v Madrid or Boca v River Plate he'd wear his Celtic top. That's just the way the fans are. The other problem is the thought that Celtic fans were cheering on the opposition. They were cheering on Larsson. Maybe they didn't care about the result of the game but they're in the majority (of the Irish public) which is unfortunate.