Well yeah, to me it's weird if someone was to celebrate another country winning as if it was their own. But there's nothing wrong with simply wanting a certain country to do well because you like their players, or style of play, or whatever.
For example I like the Italian NT, I like watching them, even go so far as to say I'm happy when they do well. And I'll talk quite a bit about them.
But there's no way I'd celebrate their victories as an Italian would, it's not my right to do so. So I guess I actually kind of agree with you, in a sense.
In any case I just don't like it when people come in & start dictating to others what sort of fan they should be, that's what I was responding to. Especially putting people down because their country might not produce players good enough to make it to the WC.