Ailes, appearing at the summer meeting of the Television Critics Association Monday, said Olbermann takes shots at Fox's O'Reilly because it boosts his ratings.
"Clearly he has no viewers except those he gets when he attacks Fox News, and particularly has made himself committed to continuing to attack Bill," Ailes said.
Olbermann opened his Saturday session at the critics' meeting by whipping out the mask and giving the Nazi salute.
"I really think that's over the line," Ailes said.
During his Countdown show on MSNBC, Olbermann regularly tweaks O'Reilly. Olbermann has named O'Reilly his "Worst Person in the World" at least 15 times. The nightly award is Olbermann's way of criticizing what he deems bad behaviour.
O'Reilly has referred to Olbermann - although not by name - as a "notorious smear merchant" and pointed to the low ratings for Countdown.
The O'Reilly Factor on Fox is No. 1 in the cable TV news ratings. Olbermann generally runs third in the same time slot against his conservative rival.
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O'Reilly says a lot worse things about other people so it's nice to see someone calling him out for the twat he is. The man is so pompous and arrogant I don't know how he could possibly be #1 in news ratings