Teacher's grammar

[EmmalinaC]

DD1's teacher has written 'You're decoding skills are excellent' in her planner. Would it be very unreasonable of me to highlight this error and add the note 'Your grammar is not'?

So... The book that DD's teacher chose for her to read today was entitled 'A Mammoth Mistake'. He doesn't usually make a note of the title...

She may be dyslexic and gets confused - I know I am and don't see the difference...