Nationalism is brutish and despicable. It's not something you can chose, and it's therefore not something you should be proud off, certainly not enough to be prepared to declare war to seperate from another state. Unless that minority is actively being repressed by a majority, in which case since the oppressors aren't playing by the rules, it may be nessecary for you to fight back. But of course, since the root of any such conflict would be nationalism, then it all comes back to the central fact that nationalism sowes only death and destruction.