The feud between Fox News' Bill O'Reilly and MSNBC's Keith Olbermann has morphed from a sometimes amusing spat between cable news hosts to a clash of corporate titans.

As Howard Kurtz of the Washington Post notes, O'Reilly has attacked General Electric Co. (NWS: GE) Chief Executive Jeffrey Immelt for being "responsible" for the deaths of soldiers in Iraq because the MSNBC parent does a tiny amount of business with Iran which, apparently, is coming to an end. O'Reilly even sent a crew from "The O'Reilly Factor" to GE's annual meeting in Erie, Penn., to buttonhole Immelt and GE shareholders about the issue. One fund manager even called Immelt a "Benedict Arnold CEO" on the Fox program.

On his show, Olbermann often awards O'Reilly the title of "Worst Person in the World," a bit of shtick that's getting tiresome. Everything that O'Reilly says and does irritates Olbermann. Then again, so does Britney Spears.

But that's not the whole story. Fox News chief Roger Ailes warned NBC Universal head Jeff Zucker that "if Olbermann didn't stop such attacks against Fox, he would unleash O'Reilly against NBC and would use the New York Post as well," according to the Washington Post. This underscores the arguments of liberals and progressives that Fox and The Post are the winged monkeys of their corporate masters at News Corp. (NYSE: NWS). Fox, of course, denies Ailes threatened NBC.

The back and forth between the two media conglomerates shows that nerves are starting to get frayed and that life -- sigh -- is a lot like high school.