When the first hominins (human ancestors) began hunting and gathering on the open savannah, they lost their body hair, likely to keep cool amid the strenuous exercise of their lifestyle. These early humans probably had pale skin, much like humans' closest living relative, the chimpanzee, which is white under its fur. Around 1.2 million to 1.8 million years ago, early Homo sapiens evolved dark skin.
Odd Cause of Humans’ Dark Skin Proposed (Live Science, Feb. 25, 2014)
It's worth to remember that white, thin-lipped Europeans in this respect (lip size) look more like apes than thick-lipped black Africans do. And white people tend to be much hairier than most other ethnic groups (Wikipedia).
Cross-class alliances against declassed others are a hallmark of racism.
Theodore W. Allen once defined it as “the social death of racial oppression”, that is:
… the reduction of all members of the oppressed group to one undifferentiated social status, beneath that of any member of the oppressor group.
Comparing black people to monkeys has a long, dark simian history (The Conversation, Feb. 29, 2016
Whenever somebody says that the white race rules the USA, it should be pointed out to them that the white race as such rules nothing. It's just a way of making poor white people feel superior by association. (But also why they insist that black people have to 'know their place.' Poor white racists are in many ways victims of their own racism - and stil considered white trash by those who actually rule.)
A long Danish article about the cancellation of Roseanne: Working-Class Heroine or Racist? (dr.dk, May 30, 2018)