How does the 50/50 reality work in the workplace

I am curious about how to think about the negative and difficult interactions that occur during the work day. It seems like half of our thoughts and interactions with clients or patients will be negative over the course of a work day or week. Of course, we get evaluated with the expectations that all our patient and client interactions should be “excellent” and even get rated online. How can we improve or manage our thoughts about this issue.