Caitlin Clark's younger brother has put Washington Mystics owner Sheila Johnson on blast after her comments about his sister.

Washington Mystics owner Sheila Johnson appeared on CNN earlier this week ... Caitlin Clark fans have rightfully been ...

Sheila Johnson is America's first Black female billionaire ... I would have told my younger self to take time to learn who I really am. I don't think I really knew myself the way I do now.