I think the parent is referring to an element of we-told-you-so in this letter. I think around the "instead, you brushed off our claims" part of the letter. I

I think the parent is referring to an element of we-told-you-so in this letter. I think around the "instead, you brushed off our claims" part of the letter. It sounds a bit confrontational, though perhaps it's too late to rewrite.