If a mask is worn properly over one's nose and mouth, it helps prevent the spread of aerosolized particles that may include COVID-19. However, it's now common to see people go through the motions of wearing a mask while defeating its intended purpose. The best example of pandemic theater is when people wear a mask as a chin strap, or when people wear a mask but lower it to speak.
Based on this behavior, the reason for wearing a mask seems to have transitioned from preventing the spread of aerosolized particles to being seen wearing a mask. Pointing this out directly is unlikely to change behavior. However, an SNL-style satire highlighting this irony may be more effective.
Perhaps public health officials should consider using comedy more to encourage desired behavior, especially since there is poor compliance with the current messaging.