walked out in the middle of an interview with CNN, after being repeatedly questioned about her "mean" style of humor.
Joan was promoting her new book, "Diary of a Mad Diva" . . . but CNN's Fredericka Whitfield repeatedly asked her about how she criticizes celebrities' clothes on "Fashion Police", and the borderline offensive jokes in her book.
Initially, Joan playfully defended herself . . . and denied that she actually hurts anyone's feelings. But then she got more serious, insisting that what she does is just HUMOR. She said, quote, "Life is very tough . . .
"If you can make a joke to make something easier and funny, do it! . . . I'm really going. All you've done is negative. I've made people laugh for 50 years. I've been put on Earth to make people laugh . . .
"Stop it with, 'And you do this, and you're mean, and you're that.' You're not the one to interview a person who does humor. Sorry!" Then she stormed off.
(Here's video. Whitfield later added that she did not believe this was a stunt, and that Joan WAS ticked off . . . because afterward, she cussed them out.)