Generally it is so, but sometimes in photography it is not true.
The first snowfalls, in fact, often coincide with the hysterical diffusion of representations of a blanket that, instead of being candid, is blue-smurf, gray-mouse, yellow-pee or shitty-brown.
The cause? Being absent dominant elements that are reflected in the snow, the error is always the incorrect white balance.
Even if we work in RAW, a careful white balance, in manual, is always desirable.
It is indeed true that we can modify it during the RAW development phase, but starting from an already correct base will be of great help, at most we will have to give a light “cooling” or “warming” and.
Traditionally I use the 18% gray cardboard method, but I have long used a system that I think is more comfortable (the cards are often lost or broken, at least so happens to me, and then go backed somewhere, or kept in someone’s hand).
I use a sort of “cap” on the lens (be shure to choose the one of the right diameter for at least one of the objectives that you always carry with you!): fix it and follow the procedure of your specific camera.
Well done, you’ll have a fairly accurate white balance based on the exact light you’re photographing.
Obviously you must redo the procedure when the light changes color in a evident way, as at the golden or the blue hour.
If, then, you do not know how to juggle with the white balance and you still have problems of strange dominant colors, here is my secret and definitive tip : be smart and desaturate the snow in the post production phase! ;-)