The people will scrutinise our presidencies. Did we manage to bring peace, security and prosperity for the people or insecurity and unemployment? Did we defend the rights of all people around the world or imposed wars on them, interfered illegally in their affairs, established hellish prisons and incarcerated some of them? Did we bring the world peace and security or raised the spectre of intimidation and threats?
I can see George W. Bush's reply: "Who cares what they think?" Besides, he's a lame duck, who has managed to not bring peace, security, and prosperity, hasn't defended the rights of people around the world, etc., etc. and so forth. Not that the Iranians running their government are nice folks- I think they're seriously disturbed.
But given W's track record, why should Ahmadinejad expect Bush to care about any of this?