I would have shook Chavez' hand too. I'll bet if the hand were offered, so would Bush. Although Bush wasn't likely to go and sit for hours as leader after leader lambasted America in some sort of weird, more serious, version of a celebrity roast and therefore wouldn't like have the chance to shake that hand.
So George Bush wouldn't attend the Conference of the Americas? Really? That's odd. I could've sworn that he delivered the keynote speech at last year's event.