I think his anger towards the US began when Iraq invaded Kuwait. He offered his "Army" to help Saudi Arabia, but was rejected. The Saudi's then asked for American assistance. Athough America helped supply his army while fighting the Soviet's he was angered that the Suadi's prefered American assistance over his own. At least, this is how I understand his hatred for America.

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"Don't one of you fire until you see the whites of their eyes! Powder is scarce and must not be wasted. Fire low! You are all marksmen and could kill a squirrel at a hundred yards. Reserve your fire and the enemy will all be destroyed! - Israel Putnam, at the Battle of Bunker Hill, 1775
"War is a conflict of great interests which is settled by bloodshed, and only in that is it different from others." - Karl von Clausewitz