Here's a piece from ESR where he describes an unnamed race. Let me say upfront that I guess I'm one of the terrible anti-racists he warns you about in this very piece..

> One was: their skin color looks fecal. The other was: their bone structure doesn’t look human. And they’re just off-reference enough to be much more creepy than if they looked less like people, like bad CGI or shambling undead in a B movie. When I paid close enough attention, these were the three basic data under the revulsion; my hindbrain thought it was surrounded by alien shit zombies.

The overall piece's conclusion is "I, ESR, am so enlightened that that I managed to overcome this perception". http://esr.ibiblio.org/?p=5001