I don't view the issue of "superiority" as having any real pertinence to the cause of White nationalism at all. Another race could exist that was more intelligent, more beautiful, and more civilized than us... and we should still care about the survival and well-being of our own race. Why? Because it's our race, the life-force which gave rise to us.
I look at other races, and don't view them as "inferior"... just as different from us. The North American Aboriginals had their own life-style, and it worked for them perfectly. They survived the ravages of life with Nature, which is what any species is meant to do. They didn't have our technology - and didn't need it. They didn't have maps showing countries with political borders - and didn't need them. Some of the things we might pride ourselves upon as being "superior" about are all very nice and well for us to have, such as advanced medicine or flights to the Moon, but they really aren't quite necessities for survival.
For me, it has never been an issue of "superiority". White nationalism isn't about hubris, chauvinism or superiority, but simply the right of a people to exist and live free. It doesn't matter if you could find a dozen other races that were "superior" to us in one, or more, or even every, way: Whites are still a distinct people with a right to self-preservation and self-rule. And fighting for such rights in a world where our liberty and very existence are endangered is what White nationalism is all about.