Recently, one of the events on the WeChat screen was the accidental killing of a female artist by a drunken man, which sparked a heated debate in the WeChat circle of “stay away from trash people”. According to online information, the female artist took her fiancé to the hospital to visit her sick grandmother on the night of April 29, and met a drunken man downstairs in the inpatient unit, just because he accidentally touched her, the drunken man had an extremely bad attitude and cursed. So, the couple and the drunkard theorized. As a result, without saying a word, the drunk suddenly drew a knife and rushed the girl to stab her twice, which was fatal, and then also chased the female artist’s fiancé all the way to cut him, resulting in his fiancé being cut three times in the leg while running for his life. Afterwards, some people lamented: “If the two people did not go to the hospital at that time, if they did not meet this drunk, if …… Unfortunately, life is not if. Such a tragedy reminds us once again: please stay away from trash people!” I found a more “authoritative” definition of trash people from the Internet, with a “you like to reason, he likes to play with life” summarized the characteristics of trash people. I quote the specific descriptive definition here: “This person’s body is filled with jealousy, complaints, hatred, irritation …… all kinds of junk emotions, distorted human nature. Full of complaints about society, disappointed with life, hot-tempered and reckless. They live in all walks of life, absorbing negative energy. The more garbage in the body, the more bulging belly, when the intolerable, never hurt themselves, but like to hurt others to vent the pastime.” According to this definition, I think such a manifestation is very much like a psychopathic state described by psychiatry: bad mood disorder. A bad mood disorder is a chronic, persistent disorder of the mind. The American Psychiatric Association’s definition refers to it as “persistent depressive disorder”. According to the textbook, a person with dysphoric disorder has significant depressed mood for more than two years, with symptoms of depression such as loss of appetite or bulimia, insomnia or sleepiness, low energy or fatigue, low self-esteem, difficulty concentrating or making decisions, and feelings of hopelessness. In fact, in my clinical work, I have observed patients with dysphoric disorder who experience both significant dysphoria and depression, as well as cognitive errors and distortions that occur on top of dysphoria, and the resulting hostility and impulsive aggression toward others. In layman’s terms, these patients’ basic state of mind is “unhappy” and their cognitive distortions are “disagreeable to everyone and everything” and “picking bones out of eggs”. “This negative cognitive tendency is reflected in interpersonal relationships, which means they are extremely sensitive to the words and actions of others and are very prone to “self-involvement”. At the same time, they are full of resentment and hostility toward people in their surroundings, and when they encounter certain stimuli that make them more “upset”, they will appear to others as inexplicable, but they think it is logical to have explosive anger and aggressive behavior. More commonly, such patients are always upset, always feel that others treat them badly, always feel that others owe them, and always want to pick fights with others. Especially when they take other people’s unintentional mistakes as deliberate, they are extremely prone to seemingly “playful” aggressive behavior. The target of their attacks may be both strangers who inadvertently offend them, and “acquaintances” who survive in the same environment. But in their minds, these acquaintances have offended their dignity and violated their bottom line, because “they did the first day, I will give them a fifteenth”. It is especially important to emphasize that the people they see as offending their acquaintances are often unaware of what they have done to offend them and have become the object of their grudge, not to mention when they will be attacked “unprovoked” or even viciously. Although there is talk on the Internet about staying away from “trash people,” it is not easy for the average person to identify these people who are in a bad state of mind and may endanger the safety of others. I think from the following three aspects is generally can identify such a person: 1, there is a low mood performance, always a “bitter face”, rarely smile, even if there is a smile is often a fake smile or bitter smile, never bright laughter; 2, there is a negative cognitive tendency, the opening is a complaint and scolding, no praise for people and things 3. irritable, impulsive behavior, a word of disagreement may be a quarrel or fight, to talk with fists. If you do have such people around you, stay away from them, but if their psychopathic state is not addressed, there is always a chance that they will behave dangerously as “trash people” and make others victims. As a psychiatrist, I believe that the best way is to try to get them to a specialist hospital where they can receive effective treatment and return to a normal emotional state and become a mentally healthy member of society. Because, modern psychiatric treatments are better able to treat bad mood disorders.