What a load of pish. Most Rangers fans are genuine Scotland fans as well - there's the odd eejit who wears an England or Holland shirt, but the majority back Scotland every time.. Most of us would sing "stand up if you hate Dundee" or "In yer Glasgow Slums" then sing "Flower of Scotland" at Hampden without a care in the world - oblivious to the fact that the people all around could be Dundonians or Glaswegians.
It's all part of being a club football supporter, and to complain about one team above another in terms of Scotland games is complete hypocrisy.