But the gold palm for disrespectful dialogue goes largely to "Be (a) ndit". I quote your link:
Continuing to talk to the president of the Democratic Movement, when he saw him by refusing "connivance", Daniel Cohn-Bendit mocked: "There is the omnipresident and there is the omnipresent. earth, François! ", he said. "The French know that I ride for Europe Ecologie".
When François Bayrou said that the green candidate telephoned Nicolas Sarkozy "often", and had lunch "three times at the Elysee Palace", Daniel Cohn-Bendit got angry.
(...)
“Why do you feel bad?” Asked François Bayrou.
"I don't feel bad, I find that despicable of you, because you know exactly what happens when you are president of a group (...) And this kind of game, in front of the citizens, well my friend , I tell you, you will never be President of the Republic, because you are too pathetic, ”replied Daniel Cohn-Bendit.
"I find despicable, me, to have pushed and justified acts with regard to the children that I cannot accept", launched François Bayrou, in reference to a scandal caused in 2001 by writings of the ex- May 1968 leader on children's sexuality, dating from 1975. (Nouvelobs.com)