You are about as wrong as you can possibly be.
Racism is obviously not specific, at least as far as race goes.
That's funny, since the political fiction of "race" as we today know it is
at most a few centuries old. It's rather difficult to have had racism as a universal backdrop to human existence when anatomically modern humanity is tens of thousands of years old, while "race" as a concept was practically born yesterday. People of course engaged in a wide range of atrocities based upon superstitions and misinformation (both by complicity and by deliberate planning) for far longer than that, but "race" mythology-- and actions based upon it-- is a very recent development.
History attests to that abundantly,
Oh really? Care to cough up examples of a *specifically racist* case of xenophobia or rationalization of atrocity that's more than a few centuries old? It's easy to find ancient cases of nationalism/statism, classism, religious persecution, factional in-fighting, etc., but not "race" mythology or its implementation through treating "race" as real.
and prehistory even more abundantly. For most of the history of the hominid line, political concepts were non-existent, yet by the time Homo sapiens emerged and finished off the Neanderthal, a whole baseball team of hominid species had come and gone, seemingly pushed into oblivion by the one which succeeded it.
Kindly explain how you alone have managed to produce evidence of the political fictions of prehistoric humans when by definition they left no records?!?
As far as recorded human history is concerned, well, it can easily be read as one act of genocide after another, from Jericho to Kosovo, involving just about every race of people, in every corner of the globe, as both victim and victimizer, depending upon the time and place.
Complete nonsense. Mass atrocity is NOT evenly distributed across human societies. Successful aggressive imperialists, however, are disproportionately represented in the prevailing narratives of history ("winners" write the history books), and so aggressive imperialism is falsely normalized (when in fact most people, most of the time, recoil from committing mass atrocities themselves...but they are all but ignored by the dominant historical narrative).
In addition to being false, it's also irrelevant. Genocide includes attempts to destroy the capacity of a people to live and exist as a people. While it does certainly INCLUDE attempts at racist extermination, many acts of genocide, historically, have not been framed in racist terms.