Unless you are using a properly fitted M-95 mask, those silly face diapers are just virtue signaling and provide no real protection to the wearer. Face masks might be useful to catch the droplets if you were ill and coughing or sneezing, but the virus partials will still pass through.
IMO the masks are a joke but I do think they can reduce outbound viruses mainly because viruses are usually attached to water droplets which are relatively large. On top of that, and contrary to popular belief, there is no lower limit to the size of particles the masks can filter out. That’s because for smaller particles, the filtering action isn’t mechanical but electrostatic.