The remarkable thing about that article is that the writer clearly doesn't believe that the C*ltic support have always been the way he describes, and actually used to be much much worse because he's forgotten about a right few things that I could mention. To frame a full argument around a time when his club's fans were bizarrely awarded a prize for mass vagrency, littering and general drunkeness (the very things Rangers fans were castigated for in Barcelona recently) is almost sureal in it's 'head in the sand-ness'.
Both Rangers and C*ltic supports contain a significant element of the dregs of Scottish society. I've always said the two supports have more in common than they have differencies. Both sets of fans are certainly over complacent about their respective clubs relationship with the rest of Scottish football. They both expect home games to be won in the first 20 minutes and are detrimental to their own teams chances when this doesn't hapen.