The United States led an enraged Western walkout after Ahmadinejad's latest incendiary remarks, which also attacked Israel and accused the West of monopolizing nuclear power -- at a time when his country faces nuclear sanctions.
Two US officials who had been watching the speech led the protest over the September 11 comments.
The British and other European Union delegations quickly followed after Ahmadinejad said most Americans believed their government was involved in the 2001 attacks. Canada boycotted the speech even before it started.
From out here in the real world, this kind of dramatic "How DARE you" over-reaction is like gluing a flashing neon sign to the forehead of the US delegation blinking "GUILTY AS HELL!"