I have NC because this can be outing
I perform a support role in a large school, I have been there 6 years, 3 in my latest role. The senior lady in my department is one of those 'untouchables' who became unbearable for me to work with. Constant picking of my work, put downs in front of other staff, constantly interrupting my conversations, deciding every single aspect of our shared office, down to whether I was allowed to open a window, put the heating on, even open the blinds, frequently being forced to work in total darkness, questioning absolutely everything to the point I started purchasing my own stationary... the list is endless. She is not my line manager; I discussed this with my line manager and she seemed supportive, but probably powerless to do anything about it. The head of the department happens to be the senior lady's best friend, so her behaviour was never put into question; I had no support. Eventually I managed to move to a different space and my working day got so much better. Cue to my performance appraisal, my line manager has written a sentence to the effect of 'has established strong positive working relationship with all members of staff but one relationship remains challenging'. I don't want to sign this bit because I feel it puts me under a bad light when I suffered for months, plus I doubt the other person has this written down on their appraisal. Can I refuse to sign this?