This statement is inaccurate and one-sided. Speaking dialects is not the same as being unprofessional. In formal occasions, the use of language should be appropriately selected according to the specific situation and audience. On the one hand, in formal occasions in certain regions, specific cultural backgrounds, or when communicating with groups familiar with dialects, using dialects may be more helpful in accurately conveying emotions, expressing opinions, and enhancing intimacy and cultural identity. It will not affect professionalism, but can show unique cultural heritage and personal charm. On the other hand, in more formal occasions for people from different backgrounds, such as large business meetings, cross-regional exchange activities, etc., the use of common languages such as Mandarin or English is to ensure that information is accurately conveyed to all parties. This is out of consideration for communication effectiveness and universality, and it cannot be said that speaking dialects is unprofessional. Professionalism depends mainly on multiple factors such as personal knowledge, skills, abilities, attitudes and behavioral performance, rather than whether or not to speak dialects. People who speak dialects cannot simply be labeled as unprofessional.