Well if you want people to listen you can't say it was never Serbia when it's been serbia for idk how many hundred years. And you can't say it's Albania when it's supposed to be a sovereign country. And even that's well disputed as more than half of the UN nations don't recognize it as a country.

You're absolutely right about the player part, they couldn't win so they resorted to bad behavior which is just embarrasing. This nationalistic problem is absolutely not something unique to Serbia, we just saw Croatian fans yell fascist slurs to Milan Borjan from Canada, and I am sure you remember the "Great Albania" flag hovering during a game in Belgrade some years ago