Olympic karate star hit with anti-Asian rant in California park: 'I didn't think it would happen to me'

Sakura Kokumai, a karate champion training for the Olympics, was talking on the phone last week on an outdoor basketball court in Orange County, Calif., when a man in a navy T-shirt and orange shorts began shouting at her. "You're a loser. Go home, you stupid b—-," he said in a video Kokumai later posted to Instagram . "I'll f— you up."As he drove off, he yelled anti-Asian slurs, Kokumai said.The 28-year-old, who is set to compete in the Tokyo Olympics this summer, said she was stunned to be targeted by the random abuse — and horrified that no one…