Noah was a righteous man in his generation. Rashi comments that because of these words, some praise Noah, stating that even in his generation, he was great – how much greater would he have been in the times of Abraham when it was easier to be good. Others see it as a criticism of Noah, commenting that only in his generation was he considered something special, but in the generation of Abraham he would not have stood out. Perhaps this dispute over the character of Noah is itself an indication that he was a leader. One outcome of leading is that sometimes people are unhappy – and Rashi is telling us that of Noah, this was true.