It doesn't only apply to football; the media bias, from where we sit in Scotland (and in Wales and N. Ireland, I suspect), permeates everything.
As to the point about Scots writing "Scottish" and English writing "British", this is yet another example of where English arrogance is evident - it doesn't apply to everyone perhaps, but for some (many) English people, the terms "British" and "English" mean exactly the same thing. So, British = English, and that, to us, who are also British (but who may see ourselves as "Scottish" first), is arrogant.
I could perhaps get behind a British team in, say, the Olympics, even though Scottish players would be few and far between. But don't expect us to cheer the English team, even though we're also British.
Anyway, if you can't even be bothered to read the thread and try to understand our viewpoints from the explanations we've given, then you'll never get it, and we'll continue going around in circles. So please, continue on your blinkered way.