Israeli President Shimon Peres Wednesday condemned violence by Libyan forces against civilians, saying Libyans "will not forgive" Moamer Kadhafi for the killing of hundreds of people.
"The fact that he used arms and brutally killed hundreds of people, people will not forgive him because the right to demonstrate is a human right," Peres told a conference in Madrid.
The Israeli president slammed those who had tended to see the flamboyant Kadhafi "in a humouristic way", saying "it is not a laughing matter, it is serious."
"He has been the most brutal person in response to the demonstrations (sweeping the Arab world). Kadhafi makes a joke out of all of us," he added.
A popular uprising against Moamer Kadhafi's regime in Libya erupted on February 15, after the rulers of neighbouring Tunisia and Egypt were ousted in similar revolts.
Libya's government says 300 people, including 111 soldiers, have been killed so far in the protests and resulting crackdown by Kadhafi's forces.
Protests have also erupted in Morocco, Algeria, Jordan, Yemen and Bahrain.
Peres said the anti-government protests sweeping the Arab world from Casablanca to Cairo were "irreversible" and praised US President Barack Obama's response to the unexpected collapse of Arab regimes long seen as stable.
"I think what is happening now is great, it is irreversible, it may take time, dictators cannot exist in an era of transparency because if people see what they are doing, they will ask who needs them," he said.
"I think President Obama is a very serious man, he is introducing now a change, a shift in American policy and I think basically it is right. The shift is from supporting the rulers to supporting the people."
Washington initially responded to the anti-government protests in Cairo by expressing support for the Egyptian president Hosni Mubarak, who despite his authoritarian rule has been a vital US partner in the Arab world for 30 years.
But as the protests continued top US officials became more vocal in their push for a transition to democracy in Egypt. US Vice President Joe Biden called Mubarak's resignation on February 11 "a pivotal moment in history."
Peres said dictators should be isolated with economic sanctions and moral campaigns.
"The time has come for the world to condemn dictators loud and clear," he said.
The Israeli president said "a situation has to be created in which it is a shame to be seen in the company" of leaders like Kadhafi and Iranian President Mahmoud Ahmadinejad.
Peres, the co-winner of the 1994 Nobel Peace Prize for his efforts to create peace in the Middle East, arrived in Spain on Monday for a four-day official visit to mark 25 years since the establishment of diplomatic relations between Spain and Israel.