It emerged Mr Carlton not only was telling people to "fuck off" to critics on Twitter, but the Herald Sun reported he was also serving abuse to those who contacted him via email.
Mr Carlton quit Wednesday and took several parting shots at the News Corp media outlets who were reporting his departure as lead news and the readers who disagreed with him.
One of Mr Carlton's good friends and Sydney Morning Herald investigative journalist Kate McClymont felt it was a sad day for journalism.
Mr Carlton is the latest high-profile departure from the Sydney Morning Herald following several rounds of cost cutting and redundancies. There is no word yet whether he'll continue to report and write for another Australian publication.