Most real white nationalist/white power types freely admit to being so.
Your issue is you try to call anyone to the Right of Mitt Romney a white nationalist.
and then assume that any form of nationalism has to have a racist component to it.
The day you show me a nationalist who welcomes Hispanics and Muslims, I'll believe that.
I am a nationalist.
I believe in the US as a concept and as a country.
I have zero issue with legal immigrants, regardless of race.
What I want immigrants to do is to be able to assimilate to our country. that doesn't mean giving up one's culture, but it does mean subordinating it to the overall culture of the United States.
That as a base means acceptance of Religious and Political liberty, acceptance of the separation of powers in the government, acceptance of federalism, and acceptance of the identity as an American.