It doesn't happen often, but sometimes one hears lawyers bemoaning the irrationality or downright arseyness of a client.
The advice here is useful in such situations. People are rarely bad by nature. More often they are brought to that state by pressure elsewhere. Understanding and accommodating that will make all the difference in making their lives better. (Which is, after all, the purpose of being a lawyer -- no?)
Most clients have spouses, or parents, or siblings, who seem to be quite capable of loving them. Most have a boss who has promoted them. It is wise to assume that, even if their behavior is bad, they have some ability to get by in life. True psychotics are pretty rare in business. Furthermore, truly bad behavior, more often than not, comes from decent people who are stressed out. If someone is behaving badly, it’s a good bet that they are afraid–of losing something they have, or of not getting what they want. If you can identify that fear, then you can replace demonization with a real problem statement, which is a far more productive approach. If, further, you can talk about that fear with your client, you will create a lasting bond that can serve you both well.