That depends on what you think the definition of "white" is. The one you prefer --- "of various European origin" --- is not the only one, and is in fact ahistorical: several European ethnicities were not "white" until relatively recently.

I think people need to come to grips with the fact that there are definitions (obviously not the only ones but not the least important ones either) of "white" and "non-white" that boil down to "human" and "subhuman". That's not a thing I'm making up as message board rhetoric; it's a simple fact.