A Baker's Mistake - A sneaky way to say someone is wrong, but you're too cool to

A sneaky way to say someone is wrong, but you're too cool to let them know you noticed.

'You said the sun is green? I’m just gonna nod and smile like I knew that all along.'

'You said the sky is red? I’m gonna keep eating my sandwich and not say a word.'

'You said a cat has 10 lives? I’m just gonna pretend I heard that from my cousin.'