That sounds easy on paper but I know plenty of white dudes who work outdoors who are darker on a consistent basis than many Mexicans. Defining somebody’s “whiteness” just based on shade would exclude a lot of people these fuckers don’t want to, and vise-versa.

The list of exceptions would wind up being longer than the rules. Of course we all know that in reality if such a thing were to actually happen, it would ultimately just devolve to fascists playing favorites on an individual basis with inconsistent, ever fluid, and capricious so-called criteria that are just a flimsy excuse to justify disposing of their personal enemies.