We read God's answer at the beginning of this weekly portion.
“I appeared [lit. I was seen] to Abraham, to Isaac, and to Jacob.” (Exodus 6:3)
Thus pointing out to Moses that the Patriarchs never questioned His decisions as God the Almighty, because their love was truly unconditional for Him.
“Thus said the Lord God: 'behold, I am against you, Pharaoh king of Egypt, the great dragon that lies in the midst of his rivers, who has said: “My river is mine own, and I have made it for myself”'.” (Ezekiel 29:3)