If you describe someone as ~, you mean they are very proud of their nation. They also often believe that their nation is better than any other nation, and in this case it is often used showing disapproval.
...the ~ pride of the Catalan people.
ADJ
NATIONALISTIC
Meaning of NATIONALISTIC in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012