When I lived in California, I knew a radio personality who-shall-remain-unnamed. His show was kinda big in the area, had some exposure nationwide, but wasn't SUPER-HUGE. On the air, he was a loud, obnoxious, sarcastic, crude jerkass. In person? Complete teddy bear who was always afraid of accidentally hurting people. Really nice to people he would have yelled at on the radio. Generous and polite to a fault, and pretty much the opposite of his on-air personality. When asked why?
"Well, that's what it takes to keep the show going."