This is something every pan-racial (for lack of a better term) movement will run into. Every movement needs its foundational myths (in the folkloric sense, not the "stories that are false" sense) and common beliefs to function. When you're trying to unite disparate peoples whose main reason for joining together is to increase political/bargaining power, you're going to have to either choose to prioritize certain narratives over others or create new narratives whole cloth.

The crackers have to label this as a "pan-racial" thing because they don't want to admit that "whiteness" is a construct and they have no culture.