The Alt-right is not white supremacists and trying to name it as such will only strengthen the resolve of it’s adherents to fight. A better description would be a group against political correctness and Globalism that tends to be socially liberal.
I wouldn’t call it white-supremacy either - some of the folks on alt-right would probably be call white defenders. They see their color as legitimate as the others, in other words, regardless of color we should all be treasured.
And I would also state that the majority of alt-right is not concerned with that issue at all anyway - much of the alt-right is not pissed off white hipsters.