"Nationalism: identification with one's own nation and support for its interests, especially to the exclusion or detriment of the interests of other nations."
How is that even remotely "white supremacist"? And are you calling Asians white supremacists? Because a fair number of Asian countries are highly nationalist, including Japan and China.
There are also a number of middle-eastern countries that are quite nationalist as well.
Hell, the left /celebrates/ the movie 'Black Panther', which depicts a supremely nationalist, and in fact /isolationist/, country in Africa, much like Japan used to be. And it became the most advanced country in the world thanks to those policies (as well as their supply of marysuemantium, the omnipotent macguffin metal that they kept to themselves.
Even by the end of the movie, they haven't given those policies up, they've only dialed them down a little bit. The holographic "shield" over the country was still there hiding them in Avengers Infinity War.