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I'll take "that happened" for 100, please.
I actually kind of believe it, because kindergarten/elementary teachers are often from arts & humanities backgrounds, and it's not at all rare to find one who never passed a high school STEM class and therefore prone to get flustered easily when called upon to explain the reasonings behind even simple things.
Can you fail all your STEM classes and graduate high school?
I literally had that experience in grade 2. The class was asked a negative numbers question, I answered the question correctly but the answer was “impossible”. I wasn’t reamed out but I was shut down hard so I wouldn’t confuse the other kids.
Also had a similar experience. 2 of us in class knew negative numbers, teacher told us our answers are wrong and that the answer is "impossible", plus "you're not supposed to know that yet".