Man, I hear ya... sometimes these evals aren't fair. I had some pretty bad stuff on mine from an evaluator that would have made it on my deans letter but was removed for a few reasons...
1. I demonstrated that the problem was not recurring both within the rotation and in other rotations.
2. Spoke to the evaluator and gave my side of the story. I did not ask for it to be edited at that time, but this is a possibility at some schools.
3. I spoke with the chair of the rotation, and got feed back and gave my side of the story at the time of the feedback.
4. Spoke with chair again after 3rd year was near completion. Asked if it be removed or edited, and it was.
Evaluators, residents in particular, are under great stress and could sometimes care less if they mess with your future, wether the comments were fair or unfair.
Thankfully, the chair of my rotation recognized all these factors and was gracious in removing the comment. Note, I'm not sure if the dean of students can edit, too. You still have a chance that the comment or evaluation be removed or edited.
Above all, I learned I don't want to be one of those evaluators that takes out their frustrations on a student with nasty evaluations without confronting the student first and giving them an opportunity to correct themselves or clear up any miscommunication.