Nope it's not. Racism falls under the Right to the freedom of speech (at least here in the States). Racists can assemble together under the Right to Assemble. Non Public Insitutions like ICC can hold gatherings where they can outlaw certain behaviors eg. Racism-so racist issues are dealt with within that body. Dealing with Racism as a criminal offense leads to a slippery slope where I feel such a ruling could be unfairly used to abridge the rights of speech and assembly of parties of differing political viewpoint.
Serious things like murder, sexual misconduct, etc. has ramifications in actual society so actual measures are carried out there; additionally, institutions like the ICC can add further punitive measure if they find the behavior under violation of a Law or ruling.