In Chinese culture, 讲理 is deeply tied to the concept of social harmony (和谐, héxié). The goal of a discussion or disagreement is often not to prove one person right and the other wrong, but to find a mutually acceptable resolution that allows both parties to maintain a good relationship and “save face” (保住面子, bǎozhù miànzi). A Westerner might try to “reason” by presenting a list of objective facts and evidence in an adversarial debate. While this can also be part of 讲理, the Chinese concept is often broader. It involves appealing to:
Therefore, “being reasonable” in a Chinese context means being logical while also being socially astute and empathetic. Simply shouting facts without considering the context or the other person's feelings would be considered very `不讲理` (unreasonable).
讲理 is a versatile term used in many daily situations.