But what I wonder is, while it's true some of our traits make sense in a way, why is god so mad and disappointed in humans, when he knew our many traits would backfire horribly and cause suffering
God cannot be omnipresent, omnipotent, and omnibenevolent while humans are sinful, without God indicting himself. If God is the Creator, then God has dominion over everything. Even giving us the choice makes him complicit in the ultimate outcome. It's a logically inescapable conclusion.
So you are right to question why God would become indignant over human sin when he supposedly knows long before the actual ever takes place what we will do, and is the one who created us with said desire in the first place.
"Men never do evil so completely and cheerfully as when they do it from mistaken conviction." — Blaise Pascal