Unfortunately definition of what is White has changed over history
It continues to be redefined as people are never satisfied
Scientific Fact
In animal kingdom , nature often creates white gene replica of animal from normally coloured animals
So variation of skin tone is natural occurrence, every 100,000 births or 100,000,000 births a white replica is created with gene mutation.
In wild camouflage played vital role to hide oneself , in order to hunt , so having white tone was not ideal , example for White lion as animal can see them from distance. In humans being agricultural the white pigmentation copies remained
In Humans the shades of colour have evolved geographically with lighter tones being close to parts of land where Winter /Clouds cover sunlight, so there is a geographical factor which impacts skin tone over 100,000-200,000 years
The Skin tone did not perhaps survived harsh 40 C- 50C climate around equator so certain demographics were restricted to cloudy areas , as harsh sunlight causes skin burn and other problems, so chance for long life in old days was low for certain skin variation.
It's just a pigment , gene trait nothing more.
Most humans have same basic functions
a) Wake up , seek food, work , hunt , eat , have family etc
However , Humans will continue to define themselves because they are subconsciously always trying to stand out , it is just nature of Humanity
So next time if you come across anyone harping about skin tone just tell yourself in mind , dude is talking about , skin colour mutation, just a bit confused
In Islamic faith their is 0% emphasis on your skin tone
Skin tone is irrelevant
People are judged only on basis of how they behave with others in their life times , their deeds