It’s very hard to “correct” what children have been “taught” in school without undermining the teacher’s authority. I actually think in this case, it would be much better to have a conversation with the teacher and give her a chance to make a correction to the class before telling your child, in effect, that the teacher is an idiot who doesn’t know what she’s talking about.
I think it would be better to talk to the teacher privately. It is also the most realistic to assume the children have innocently put an “extra” interpretation on to what the teacher is saying or that a remark by a classmate that the teacher allowed to stand as the student’s opinion or experience was endorsed by the teacher as fact, because the teacher didn’t presume to correct the student.
For instance, an adult knows that someone can say
a) drugs and alcohol are addictive
b) addictions ruin lives
without concluding
c) if you use a drug or alcohol, you will become addicted to it
A student raises a hand for a clarification:
Do you mean that if you use drugs, you’re going to become an addict?
Now the teacher is in a mine field!
Say no, and the student will say, “Oh, so you are saying it is sometimes OK to use drugs”
Say yes, and the student will say, “Oh, so since my parents use alcohol every night, they’re addicts”
It is very important, in fact, to give the teacher feedback about what message the child finally took in as the “take home message.”
If the teacher’s real intended take-home message was extreme on the side of temperance, I’d have no problem correcting that.