Let's establish some things first. When I say "White" or "Caucasian" I mean ethnically from somewhere in Europe, not from the Caucasus, not the color of their skin.
"Caucasoid" is White-looking. Sure, there are Arabs too who have very white skin, but they're not White (capital W). They're not ethnically from Europe. Race, as an umbrella term for a group of ethnicities, means that "White" encompasses ethnic groups from Europe. There are some Semitic-looking people in there with darker and olive skin, but they're not Semitic aka Jewish or Arab.
Literally zero people on earth hear the terms, "White(s)," or "White people," and immediately go, "oh, he means very light-skinned SAND NIGGERS AND KIKES."
JFL