Racing is a sport. It requires good training to be good at and stuff, however, it should not considered to be part of the sports genre, because mechanics are different. Not even a NASCAR game would belong in the sports category. Racing games tend to be more about speed-based challenges, where as sports are about score-based challenges. I think racing should stay as it's own genre in the gaming industry.
Racing is not a sport. While most sports do require practice like racing, sports require practice performed physically with the person's body, often with only an object like a ball or bat being the only thing a person can use. Because of this, sports rely on the physical strength of the persons participating, where racing relies on the speed of the cars and only the mental state of the person. How strong you are and how fast you can move effects every other sport but has no effect on racing. Thus, it should not be a sport.