What are considered some “White People” sports? Or sports that mostly whites watch?

Certain sports align with certain sections of society for different reasons and it's more economic or situational than race. The reason football took hold amongst the lower classes in England over Rugby was down to the injury risk. The risk of injury in football is a lot lower than Rugby. If someone got injured, they had to miss work and not get paid. Rugby therefore was not worth playing for the lower classes as they risked not working. The higher classes didn't have that worry.

Nascar as with all motorsports requires a lot of cash to actually participate, in its early years white people had more money, therefore more white people participated. Of all American sports, basketball is the easiest to play in poor urban environments and injury risk is minimal in these environments. Black people at the time tended to live in poor urban environments so it became common with black people.

Once a sport becomes part of the culture and gains a reputation, it's hard to shake that. Most of these reps were formed in the early years of the sport and that's why....

Horse racing.  

bowling and cornhole

swimming, weight lifting, wrestling