We'll start with what it doesn't mean. It doesn't mean:
"I dislike the diarist, diary, and/or ideas presented in the diary." "I disagree with the diary and its thesis and/or evidence." "I want to suppress the information and/or ideas in the diary." " I want to make an HR for disagreement appear legitimate by falsely calling CT." "The thesis in the diary hasn't been proven to my satisfaction." Or any similar silliness.
The real meaning will be addressed below the squiggly-doo