CHICAGO—Ever since being mugged by a black man, 28-year-old Caucasian Mark Weisner has become a racist, friends reported Monday. "I used to be more trusting, but I learned my lesson the hard way in October," Weisner said, alluding to the mugging. "Now I'm a lot more cautious around certain types, if you know what I mean." Weisner added that he has "no problem with Asian Americans."