N-UNCOUNT 强烈的民族情绪;沙文主义表现 You can use flag-waving to refer to the expression of feelings for a country in a loud or exaggerated way, especially when you disapprove of this. 强烈的民族情绪;沙文主义表现 [disapproval]
The real costs of the war have been ignored in the flag-waving of recent months.