It seems to me that Conan O'Brien, David Letterman, Craig Ferguson, Jimmy Kimmel, Jay Leno, and Jimmy Fallon are six very different people. About as varied a group as you could think of. To characterize them, as the media have done lately, as just a bunch of white men is, to my mind, racist and sexist. If you reduced any minority group or any group of women to "all pretty much the same" you'd come under fire, and rightly so. People are not interchangeable, even if they are roughly the same color.