Esterhuysen used the word "fuck" repeatedly in a 01:00 broadcast.
EWN editor Katy Katopodis said he had been summarily dismissed.
Although she had been unable to reach Esterhuysen by phone, a letter of dismissal had been delivered to his house.
"We can't tolerate that kind of behaviour. I don't think it's appropriate to use our platform, which is credible, to promote your own agenda," she said.
A 41-second clip, purportedly of the broadcast, on the website twitvid.com had garnered 35 000 views by Tuesday afternoon.
In it a man who identifies himself as Mark Esterhuysen, says: "Fuck racism, fuck the pigs who killed Andries Tatane, fuck the AWB, fuck racism. We are all wild animals here, meant to live free.
"Fuck capitalism, fuck fascism. Fuck this fucking wage slavery shit. Fuck domestication, fuck Julius Malema, fuck the state. Fuck the petrol economic growth on a finite planet."
On his Twitter feed, he identified himself as an enemy of the state, a defender of anarchy, a proud member of the primate clan, a cunning linguist, and a master debater.
He had tweeted that all he wanted in life "is for @GarethCliff to read my blog".
His most recent blog was on the role of sport in modern South Africa, from an anarchist perspective.
Other topics dealt with the futility of civilisation.
24.com publishes all comments posted on articles provided that they adhere to our Comments Policy. Should you wish to report a comment for editorial review, please do so by clicking the 'Report Comment' button to the right of each comment.
Afrikaans singer, Bouwer Bosch, and actress, Leandie du Randt, tied the knot over the weekend. Read More »
After weeks of voting we’re super-excited to finally reveal the winners of the 2015 Channel24 Online Awards. Read More »
Scientists and researchers believe that almost five million tons of plastic is dumped in the oceans every year and it’s affecting our food.
Cape Town CBD
HousesR 77 000 000
HousesR 2 795 000
TownhousesR 1 250 000