Type 1 diabetes: Frequent urination, unusual thirst, extreme hunger, unusual weight loss, extreme fatigue, irritability. Type 2 diabetes: Any of the type 1 symptoms frequent infections, blurred vision, cuts or bruises, tingling or numbness in the hands or feet, recurring skin, gum, or bladder infections.
Sociopaths are often unable to control their behavior and their expressions of annoyance, irritability and threats when faced with situations not appealing to them and they often tend to resort to threats, aggression and verbal abuse.
Truth is -- it doesn't. Passive aggression, when applied to everyday situations, is a red herring. You have a request from one person to another. Deciding the person asking has the high road and the person refusing is passive aggressive is just ignorant. Pop psychology of the worst sort.