As noted already, the non-N95 masks being discussed here are meant to reduce - not prevent, but nevertheless reduce - the transmission of virus from the wearer, via large moist droplets. Such masks will not stop smaller, so-called aerosolized droplets that carry virus. But when people cough, sneeze, and so on, a large part of what they exhale is large droplets. This is why such masks are often said to be 50-80% effective - they are estimated to stop half to a little over 3/4 of virus that is exhaled/projected from the wearer.
As for Menard's masks being "Chinese crap," that's an incredibly ignorant and silly statement - millions upon millions of disposable masks, surgical masks, and N95 masks are made in China, and there is nothing shoddy or for that matter different about them than the masks made elsewhere.