This is where engagement becomes essential. At the very least, communicate back that you actually fully appreciate the work, the literature, or the reviewer's missteps - they aren't infallible either you know !

But "they are smart people, i'm sure they understood". Well, i'm sure most of us are smart people, but i quite often have a hard time appreciating some papers that are outside my immediate -Tcell- comfort zone.
I don't imagine i'm the smartest cat on the block, so it might be a "me" problem.

How is one supposed to interpret a "copy and paste" editorial letter ? Did they even read anything the authors wrote ? Did they understand the work discussed ?