“You look great,” said Don Marsh, the 80-year-old host of the radio show “St. Louis On the Air,” to recently retired St. Louis news anchor Karen Foss (75 years young) when she entered the studio for an interview. The two veteran journalists then went on to have this pleasant and collegial conversation aired by KWMU, National Public Radio’s St. Louis affiliate. The next morning, Foss learned that Marsh, a St. Louis institution, was leaving St. Louis Pubic Radio. Why? Someone at the KWMU studio had overheard Marsh’s complimentary greeting to Foss, perceived it to be inappropriate, and tattled to the...