My boss has a bad impression of me. Should I quit?

I am a charge nurse working in a busy hospital environment where our staffing has been cut to point that our patients often go 3 days without baths, their vital signs are taken late or skipped, they often get their medications late. Almost daily, one or more nurses are in tears because they are so overwhelmed in their work. When I took these concerns to our unit supervisor she raised her voice at me and told me that I had a negative attitude and that if I was unhappy in my job maybe I should consider this line of work is not for me. First of all I was shocked because I am known as trying to huddle the gang together and cheer them on trying the best I can to motivate staff. This unit manager stays behind closed doors most of the time and doesn't see the job I do or the measures I gone to in order to try to make improvements in patient care and nurse satisfaction. Frankly, I was so upset, I was in tears because I couldn't believe my immediate supervisor has such a poor opinion of me! There have been few incidents in which I've had to report floor problems to her and I feel like my character has been maligned. Should I consider moving on or tough it out for the sake of the staff nurses and the patients? I'm worried if I can't turn my supervisors opinion around that I may ruin my nursing career in this job.