When Parents Undermine Teachers in Front of Their Children
Wong Sir on the long-term damage of 'don't worry, your teacher's wrong' — what he observed, why it happens, and what to do when you genuinely disagree.

Let me start with a scene I watched play out many times.
A parent arrives at school, visibly irritated, to discuss homework feedback I had written on their child's worksheet. They speak to me politely enough. We disagree about one thing — whether their child's method was correct (it wasn't, technically, but I understand why they thought it was). We come to no resolution.
Then the parent turns to their child, who has been standing beside them the whole time, and says: "See? You did it the right way. Your teacher just marks it differently."
I could see, in real time, something shift in that child's posture. A small straightening. A glance at me that was slightly different from before.
It didn't ruin the child. It didn't ruin our relationship in class. But it put something in the air between us that took the rest of the term to clear.
Why This Happens
I want to be fair to parents here, because I understand the instinct completely. You love your child. You believe in them. When someone — even a teacher — appears to dismiss something your child did correctly, the protective reflex is immediate.
And sometimes parents are right. Teachers make mistakes. We mark things wrong that aren't. We misread handwriting. We occasionally hold a pedagogical preference that isn't universal truth. I've made all of these errors.
The issue isn't whether you disagree with the teacher. Disagreement is fine. The issue is the timing, the audience, and the message it sends.
What the Child Actually Hears
When a parent publicly disagrees with a teacher in front of the child, what the child hears is not "your parent is advocating for you." What they hear — particularly primary school children, who are still building their understanding of authority and trust — is something closer to: "adult rules are optional when the adults disagree."
This sounds, possibly, like a good lesson in critical thinking. It isn't. Not at this age. Not in this way.
The child has to spend the rest of the year in my classroom. They have to decide whether to listen to me, whether my instructions apply to them, whether pushing back on feedback is always an option. Some children can hold this nuance. Many, especially younger ones, can't. And the ones who can't tend to become significantly harder to teach — not because they're badly behaved, but because they're genuinely confused about who to trust.
The Pattern I Saw Repeatedly
Children whose parents openly dismissed teachers in front of them showed a specific pattern in class. Not defiance, usually. Something more complicated: a kind of selective compliance. They would engage happily when things felt relevant or interesting, and become very good at simply not hearing feedback they didn't want to receive.
Over the short term, this is manageable. Over three or four years of primary school, it becomes an increasingly rigid habit. By the time these children reached P5 or P6, the ones who had been raised in an atmosphere of "teacher isn't always right" were often genuinely less able to receive constructive criticism — from any source.
I am not saying teachers are always right. I'm saying that the habit of dismissing feedback has consequences, and it tends to transfer from school to life.
What To Do When You Actually Disagree
There is a healthy version of this. It doesn't involve pretending teachers are infallible.
If you think a teacher has made an error, or you genuinely disagree with an approach, the sequence that works is:
First, investigate before reacting. Ask your child what happened. Ask them to show you exactly what was marked and what the question was. Children's accounts of classroom events are sincere but often incomplete.
Then, contact the teacher directly — by note, message, or meeting — and ask about it. Not to challenge, but to understand. "I wasn't sure about the marking on question 3 — could you help me understand the expected method?" Almost always, there's an explanation. Sometimes I changed my mind. Sometimes the parent did.
Meanwhile, with your child, you can be honest without being undermining. "I'm going to ask your teacher about that — I'm not sure I fully understand why it was marked that way." This models appropriate scepticism and appropriate process. It does not model dismissal.
The Private Disagreement
What you say privately, at home, about teachers matters too — perhaps more than the public moments. "Your teacher seems very strict" or "that homework seemed a bit pointless, didn't it" — these comments land and stick. Children calibrate their effort partly based on whether adults they trust seem to value the source of that effort.
You don't have to perform enthusiasm for every teacher your child ever has. But consider: what you say in passing shapes your child's relationship to school. And their relationship to school shapes their learning for years.
When Teachers Are Genuinely Wrong
I want to be clear: this article is not a defence of bad teaching. There are teachers who are unfair, who mark inconsistently, who have genuine blind spots. If your child is experiencing something consistently unjust, that's a different conversation — with the school, not in front of your child.
Your child needs to see you address problems through process and communication. Not through dismissal.
That's actually a much more useful lesson than "your teacher got that one wrong."
It's the lesson that will serve them when they disagree with their boss at 28. When they're navigating a difficult colleague. When they're making their own children feel supported without undermining the world those children have to live in.
As I said — sometimes parents are right. The question is how you handle being right.

Former Hong Kong primary maths teacher with 15 years in the classroom. Built Tutor Wong after seeing the same homework mistakes thousands of times. Believes every error is a learning opportunity — if you know where to look.
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Disclaimer: The opinions expressed in this article are those of the author alone and do not represent the views or positions of 補習天王 (Tutor Wong), its founders, staff, or team. This article is provided for informational purposes only and does not constitute professional advice.
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