You confuse Nationalism with Patriotism, there's a big difference between them. An important characteristic of Nationalism is the superiority of your nation, compared to others. This is why Nationalists can't swallow the idea that an English vote is equal to the Polish vote. Patriotism is a passive expression of love/devotion for a country, it always focus on the country itself, never other countries.
In short, a Nationalist will paint the American flag on the door of a Mexican restaurant while a Patriot will paint it on his house/business or carry it to the stadium.
Did you just make that up on the spot or do you have a source for that?