grace as in Grace, the name? If yes, it'll be 나 그레이스 싫어 (informal) or 저 그레이스 싫어요 (formal). Or since grace can be translated into 은혜 and 은혜 is a pretty popular Korean name too, you can say 나 은혜 싫어 (informal) or 저 은혜 싫어요 (formal).