The controversial world leader who spoke at Columbia University on Sept. 24 was greeted with harsh words from the university's president.
Lee Bollinger took Mahmood Ahmadinejad to task over Iran's human rights record and foreign policy.
The Columbia president said Ahmadinejad's denial of the holocaust is just one example of his character.
"Mr. President, you exhibit all the signs of a petty and cruel dictator," Bollinger explained.
Ahmadinejad smiled as he waited his turn to speak, then accused Bollinger of "unfriendly treatment" under the influence of the U.S. press and politicians.
The Iranian president said Bollinger's remarks were "incorrect" and "an insult to information and the knowledge of the audience."
His appearance at Columbia drew protests.