I was a student teacher in a jk class years back. I remember a barely 4yr old bringing their picture of a bear to the teacher. She looked at it, said bears are not green. She crumpled it up and gave him a new page. She said you can choose from brown, black or white those are colours of real bears.

I cringed. This poor child just lost any hope of being creative when older! Some people just suck with kids! They don`t mean too...but they just don`t get it.