When is the use of humor in writing considered inappropriate?

The use of humor in writing is considered inappropriate when it conflicts with the main message. In effective communication, especially in serious topics or sensitive issues, humor can dilute the seriousness or emotional weight of the message being conveyed. If the humor detracts from the core message or causes confusion about the writer's intent, it can mislead the audience or undermine the impact of the communication. This is particularly important in professional or academic writing, where clarity and focus on the primary topic are essential for effective communication. When humor does not align with the intended message, it risks alienating the audience or causing them to misinterpret the content.