Horse Racism
A more common phrase for the sport of horse racing. Much like motorcyclists, horse racers prefer to be known as Horse Racists. Just for the record, a horse race itself is more commonly known as a Whore's Race as it involves racing anything from horses and whores to a horse's whores and everything in between.
"Vic DiBitetto rode a horse named Horse Shit in the local horse race. Then he went on to ride a whore named Whore Shit in the National Whore's Race Championship! Much like a motorcyclist, he brings the Horse Racism back to all of the Whore's Racists!"