I don't know...maybe I'm just different....but as much as I wouldn't tell others that my family and I had read the book after purchasing it for a gift....I probably wouldn't tell other's what she had said.
Granted, that was a bit tacky...but at least she was "honest. I know that when I read a hardcover book that comes with it's jacket..I always remove the jacket while reading it..and since I go through books rather fast, when I sent it to my step-father he would always ask if I had read it because it looked brand new.
As I mentioned...I would never have said anything....either as a receiver or giver. That's not really very kind.