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Scilly.Suffolk-
They might (nationalism too, see Brexit) but @jj72 is right.
There are reasons for this though - nationalist ideology in the former Yugoslavia politicised nationality and ethnicity which provided the moral, political and military impetus for war, violence and ethnic cleansing. And it's still pretty recent, so the countries involved are still fiercely nationalistic.
I've not been to Serbia but I've never seen so many flags as when I've been in Croatia/Bosnia/Montenegro. In Croatia even the little carts the street sweepers push have flags on.
Fox
The Serbs do seem to love a bit of good old-fashioned nationalism.