Skin color, which vies with sexuality for distinction as the most tedious subject in America, has once again made headlines. Stephen Jackson, who won the 2002-03 NBA championship with the San Antonio Spurs and who happens to be black, illustrated the modern mind’s toxic obsession with race when he denigrated black journalist Gayle King, co-host of “CBS Mornings,” for using the first-person plural pronoun “we” when referring to fans who rooted for the Iowa Hawkeyes women’s basketball team and superstar guard Caitlin Clark, who happens to be white. “I don’t consider her black media,” Jackson sai…