when we last had parents evening the reading had just kicked off. I mentioned it and was told "we get this every year" I E parents angst over reading levels.
Its a strange conundrum.
If I was the teacher I would listen to parent, ask the appropriate questions...." OK, thanks for that, so your child is reading Matilda, do you listen to them out loud, how many words do they struggle on roughly, do you ask them about the text, OK whats their response" from there....I would then the next time I heard the child read, bear this in mind and then work out what to do.
I wouldn't dismiss the child or the parent.
If however on my own testing found the child to be lacking, I would tell the parent this in some meaty detail, and why.
If the child was more advanced than previously thought I would move them on appropriately.
I would explain how I came to my conclusions.
I know when it comes to PE its not going to be an open door discussion, its going to be me, feeling uncomfortable and nervous fighting to explain why I do not think stage 6 is appropriate.