Well, as you've said, furries are primarily white, and primarily males. On average, they come from fairly affluent families - affluent enough to afford one or more computers and a steady Internet connection, at least. From this we can extrapolate that they likely live in primarily white neighborhoods, and those of school age likely attend schools which are primarily white.
Additionally, furries are, on the whole, not particularly socially well-developed; at least when it comes to interacting with other human beings in real life. They have a hard enough time interacting with people that "look like them", so to speak; dealing with people of another race becomes just that much more difficult for them to process. Also, being anti-social shut-ins, most furries will likely spend a lot of time watching tv/movies/etc, causing them to get most of their knowledge about people of color, or hispanics, etc. from said movies and tv and such.
The only exemptions seem to be the exceptionally rare non-Caucasian furries they may meet at conventions, though even then I've witnessed the typical white-and-nerdy socially-stunted furfag types looking even more uncomfortable than normal around a black furry. (I don't think I've ever seen a latino furry tbqh.)
Oh, and of course, the Japanese are perfectly fine with furries because GLORIOUS NIPPON.