I'm not 100% sure what GP meant, but it's true that there are Jews who are white (I'm one.)
Of course, racial categories are made up anyway, but some people seem to care about these things.
Ironically, the Sephardic and North African Jews that I know are more likely to self-identify as nonwhite, but are probably still counted as white by the US Census. Goes to your point about made-up categories!