When it comes to product innovation is there such a thing as a bad idea? ABSOLUTELY.
A bad idea is one that doesn't solve the problem you've been asked to address.
The thing is, we say "there's no such thing as a bad idea" in ideation sessions because we want people to be as creative as possible.
A bad idea often spurs a good idea and we want to generate as many ideas as possible in the beginning, so we are judgment-free.
We filter out the bad ideas in a subsequent evaluation session. That's when it's good to be judgy!