You left out a big example of this: IMHO, one of the most talented and unique radio performers I have ever heard is/was the "Greaseman". The character he created back in the 70's, which grew into his entire schtick, was this Archie Bunker-like southern racisty kinda guy. It was always tongue-in-cheek. If you didn't know the show and the character, you would be outraged at some of the things he said---just as you would've Archie Bunker back in the day.
About 14 years ago, he made a flippant in-character racist remark about a black man dragged to death behind a pickup truck. As bad as that may sound, in-context as the Greaseman, it wasn't that outrageous. Doug Tracht, a/k/a "the Greaseman" by accounts of those who've known and worked with him, is one of the more decent guys you'll ever meet, yet this industry, in a fit of PC overreaction, threw him under the bus to a degree that disgusted me. Grease went on an apology tour that rivaled none. He went on every show he could, TV and radio, literally begging forgiveness. Still, many in this business, who haven't a shred of the talent he has, wouldn't give him an inch. Not an inch.
Greaseman was one of this industry's true gems, and he was treated like garbage by those with far less to offer.