Dravidians (India) have very dark skin and they appear more closely related to Australian aborigines, but 'black' people typically refers to a recent African ancestry just as 'white' people refers to a recent European or Eurasian ancestry. Asian, at least while I grew up in San Francisco with a Chinese family on one side and a black and white family on the other, referred to E and SE Asians and not Arabs, Persians, Jews, Turks, Slavs etc. Now a racist may not care where people are from and base their opinions solely on skin color but I thought they have a hierarchy of hate with some people they find tolerable and some they really hate largely independent of skin color.
You cant have racial mixing without races. India's a case in point:
"The researchers showed that most Indian populations are genetic admixtures of two ancient, genetically divergent groups, which each contributed around 40-60% of the DNA to most present-day populations. One ancestral lineage — which is genetically similar to Middle Eastern, Central Asian and European populations — was higher in upper-caste individuals and speakers of Indo-European languages such as Hindi, the researchers found. The other lineage was not close to any group outside the subcontinent, and was most common in people indigenous to the Andaman Islands, a remote archipelago in the Bay of Bengal."
https://www.nature.com/news/2009/090922/full/news.2009.935.html