@Work Advice: No good way to say it. Deflecting--or not firing--casual insults.

Thoughts on deflecting -- or not firing off -- casual insults. Reader: My supervisor pulled me into her office and told me that a document I had written for her was "no good." When I read the version she wanted me to use, I saw that her document actually was the document I sent her with a few added paragraphs. I get the need to edit, truly, but I don't get why she'd call my document "no good" but proceed to use my material.