Racism is pattern recognition. Y'know, that thing that crows do? If a specific race of people often does a certain thing (see blacks and the higher crime rates they bring) then the logical thing to do is to associate that race of people with that thing.
I can attest to race being very real. One of my favorite books regarding the matter is The Passing Of The Great Race by Madison Grant (no, he's not a foid), and I'll copy-paste a section from there regarding the racial differences in the European races because he explains the matter much better than I can.
"The use of this test, the cephalic index, enables us to divide the great bulk of the European populations into three distinct subspecies of man, one northern and one southern, both dolichocephalic or characterized by a long skull, and a central subspecies which is brachycephalic, or characterized by a round skull.
The first is the Nordic or Baltic subspecies. This race is long skulled, very tall, fair skinned, with blond or brown hair and light colored eyes. The Nordics inhabit the countries around the North and Baltic Seas, and include not only the great Scandinavian and Teutonic groups, but also other early peoples who first appear in southern Europe and in Asia as representatives of Aryan language and culture.
The second is the dark Mediterranean or Iberian subspecies, occupying the shores of the inland sea, and extending along the Atlantic coast until it reaches the Nordic species. It also spreads far east into southern Asia. It is long skulled like the Nordic race, but the absolute size of the skull is less. The eyes and hair are very dark or black, and the skin more or less swarthy. The stature is stunted in comparison to that of the Nordic race and the musculature and bony framework weak.
The third is the Alpine subspecies occupying all central and eastern Europe, and extending through Asia Minor to the Hindu Kush and the Pamirs. The Armenoids constitute an Alpine subdivision and represent the ancestral type of this race which remained in the mountains and high plateaux of Anatolia and western Asia. The Alpines are round skulled, of medium height and sturdy build, both as to skeleton and muscles. The coloration of both hair and eyes was originally very dark and still tends strongly in that direction, but many light colored eyes, especially gray, are now found in the Alpine populations of western Europe."
