Don’t write your opinions about patients. If the patient says something unpleasant, document it as a quote rather than “judging” that she was unpleasant. If she reads the note, she will see what she said, not a judgmental comment from you.
You may have to “explain” what you meant by a subjective comment about a patient long after you wrote it. But you’ll never have to explain what a patient’s quote meant – it will be self-explanatory.