I agree with the spirit of this article, however i question the use of the pejorative, alienating label 'supremacist.'
I agree there are supremacist groups among this gathering but a list at another article indicates they are a minority of the groups and the rest of them would be better characterized as white nationalists.
Even Richard Spencer, aka Emmanuel Goldstein from 1984 has said Asians are smarter and Blacks better athletes...that does not sound like supremacy
The label 'supremacist' is routinely used to tarnish all gatherings of whites no matter how benign.
The use of 'supremacy' is alienating. offputting and misleading.  The basic truth is this: Whites in 1964 agreed to give up their racial identity for the chalice of diversity but the bargain was not kept. Whites gave up their identity, are taught that idea over and over in schools, while all other ethnic groups lobby using identity politics. Why can't Whites lobby like other groups? It is not supremacy, it is survival.