Noah's contemporaries were less than impressed with his flood warnings. To them, he was a lunatic preacher working on an insane construction project. He preached for one hundred and twenty years but Noah’s sincere warnings fell on deaf ears.
No one chose to correct his or her course and turn to God, despite Noah’s pleading that doing so would save their lives. Even worse, the people mocked Noah, mercilessly ridiculing the old man who was building a giant boat on dry land.
People continued their lives as usual. They simply saw no reason to believe the good times would ever come to an end. What Noah preached sounded ridiculous to them. There were no precedents of worldwide floods, after all.
People ignored Noah but, as the time of the predicted flood approached, animals of every species on earth began to enter the ark. Still the masses were unswayed. They were going nowhere. This was herd mentality at its worst.