The Lord saw that the wickedness of man was great in the earth, and that every intention of the thoughts of his heart was only evil continually. And the Lord was sorry that he had made man on the earth, and it grieved him to his heart.
This is one of the more difficult descriptions of God in all of the Bible. And it comes pretty early in the text. It is the sight of God grieved. The pre-flood narrative shows us a world where promiscuity, violence, wickedness, and power run amuck have become the standard culture of the human race. There is a phrase that is particularly chilling: "that every intention of the thoughts of his heart was only evil continually."
There is a three-fold intensification of the evil of mankind that is frightful: 1) every intention was 2) only evil 3) continually. That was what finally grieved the heart of God. And the story of Noah is the story of one family's survival in the midst of what God saw as ONLY an evil culture. There was nothing redeeming about it. The solution was to wipe it out and start all over.
When I see God grieved in scripture, I need to take notice. He does not like to see sin in His creation. He does not like to see a society overcome by wickedness. And it will be dealt with. I refrain from social commentary ONLY because it is SO obvious. Today, almost all of society is overcome by an anti-God, naturalistic bias that has led to all sorts of evil being tolerated. In fact, such tolerance is now a virtue to most. Where is it going? I can only think toward grieving God and inevitable, consequential judgment. That is what happens when God is grieved.