The way I read it, it's more of a social interaction phenomenon than whether ideas are inherently good or bad. Something about knowing that people in the group

The way I read it, it's more of a social interaction phenomenon than whether ideas are inherently good or bad. Something about knowing that people in the group disagree with some idea that's presented, and the reasons why they disagree, might be more important for improving your creativity than your own isolated assessment that an idea you heard is wrong.