Racism was not a problem on the Discworld, because - what with trolls and dwarfs and so on - speciesism was more interesting. Black and white lived in perfect harmony and ganged up on green.
The races of the Epsylon System are varied and proud, often conflicting against one another for control of territory and supremacy. However, most of them tend to agree on one thing: the genetaur are disgusting perversions of nature and should be purged.