Ever since Antifa and the neo-Nazis have started squaring off (two of the most loathsome groups on the face of the planet, add Black Lives Matter for a trifecta), the mainstream media and Progressive-Left have been trying to substitute the "nationalist" for "supremacist." The two are not interchangeable.
It's a tactic of the Progressive movement dating all the way back to its genesis. They have been redefining the meanings of words and subtlely injecting inappropriate words into labels so as to change the meanings to suit their goals.
Nationalist, by traditional definition, is someone who is fighting for national independence, or a strong national government. In other words, a nationalist is someone who believes in his/her country; someone who is patriotic.
A supremacist, on the other hand, is quite different. A supremacist is someone a person who believes in or actively advocates the supremacy of a particular group, especially a racial group.
So, why do the mainstream media and Progressive/Democrat politicians and activists believe that the two words can be interchangeable? Nary a day goes by when we aren't told by some opportunistic politician or disingenuous talking head that neo-Nazis are "white nationalists." Of course, they are not, they are "white supremacists."
The reason that Leftists in politics and the media are trying to stain the word "nationalist" is two-fold. First, they want to kill the word. And second they want to tamp down any patriotic resurgence in the population like when Reagan came to office.
By co-opting the definition of the word, Progressives seek to marry it to the darkness of the neo-Nazi movement so the majority of the population was stigmatized by the word; repulsed by it.
The last thing Progressives want is for a resurgence of patriotism to surface. With Trump's America First agenda, a growing sense of patriotism -- and an understanding that a strong and prosperous United States is great for the entirety of the free world, would negate the whole of Barack Obama's eight years of Progressive rule and achievement.
Progressives truly thought that the Obama presidency presented the opportunity to bring the ball over the goal line; to ultimately transform the United States from a Constitutional Republic to a Socialist Democracy controlled by oligarchs. A resurgence of patriotism (read: nationalism) would kill this eight year effort.
This is just another piece of evidence that proves the mainstream media is in the pocket of the Progressive Left, and another reason why true Americans, patriotic Americans -- American Nationalists -- need to be very cautious about where they consume their information. Lord knows politicians can't be trusted.