"I see it as another bell curve of what educational experience the child receives."
The curves I see are more like a cumulative distribution function that starts low, gradually increases and converges on the child's "potential" courtesy of life experience.
Regarding attitudes I think there are significant genetic influences on behavioural traits. My DD has what you might call a natural growth mindset. I expect we could have suppressed some of that, but I'm doubtful about being able to create it.
"who hold that their child's rudeness is due to their child being considerably more intelligent than you."
Given the above I'd blame part of that on gene-environment correlation, but there's clearly some wriggle-room for nurture.
"It should not come as any surprise..."
Suppose not, but I naively expected eduction to be more objective, not behaving like some neurotic adult hopping from one life-style fad to the next. That said the emergence of ResearchEd, EEF etc. are quite encouraging.
'I especially like the idea of the "gift of honesty"'
I think Gail hit a lot of targets and it's a bit depressing that they're writing for the USA i.e. that it's so similar here. I also liked the honesty point, although for me it's more about a perceptive child continuing to value my opinion.