A gifted kid is at least 2 standard deviations above normal, whereas a kid 2 standard deviations below normal is considered developmentally challenged.
Ask them if they would try to teach a kid 2 SDs below normal with the same curriculum they use for normal kids? Then, ask why it would make sense to use that same curriculum for kids 2 SD above normal?
Maybe a graph to give them a picture.
I haven't done the math to make this consideration completely accurate, but it would be nice to explain to people that there is as much variation in ability among those in the top 3% as there is in the next 47%. (Adjust the numbers for accuracy).
