I personally would take a letter in tomorrow and copy in all the relevant people, detailing what you believe was said ..
have done below as a starting point as I am obviously not emotionally involved .. feel free to ignore me
Dear Head / Head of Teacher / Teacher
I am writing to request / demand a meeting following tonight's parents evening where Mrs xxx's comments about my parenting and my child's behaviour took me completely by surprise.
Obviously I appreciate that any issue with my child's behaviour must be addressed and I am hopeful that we can agree an action plan to hel phim to overcome any such issues.
Further to my meeting with Ms xxx, I understand the following:
My son fiddles when he is under pressure
It was inferred, unprofessionally in my opinion, that XXX has problems with concentrating when Ms xxx speaks
I would like to establish Ms XX's training with regards to coping with children with dyslexia as I am concerned at her response to some of DS's obvious issues.
I am slightly concerned that the relationship between ms xx and my family may have disintegrated already to a stage where we will be unable to develop an appropriate action plan. I will admit to feeling personally insulted and demeaned by some of Ms X's remarks which included comments on my ability to control my 3 children outside of her classroom and her advice that should my 10 year old forget his lunch he should be made to starve to learn a lesson.
I would very much appreciate a meeting to discuss these issues and agree an immediate action plan
Please telephone me on xxx xxxxxxxxx
Yours sincerely
...............................................
Hth