That isn't genuine. It is a cherry picked line, meant to be dishonest and misleading:

The typical mask you buy in the drug store is not really effective in keeping out virus, which is small enough to pass through the material

becomes

Masks are really for infected people to prevent them from spreading infection to people who are not infected rather than protecting uninfected people from acquiring infection. The typical mask you buy in the drug store is not really effective in keeping out virus, which is small enough to pass through the material. It might, however, provide some slight benefit in keep out gross droplets if someone coughs or sneezes on you

Anyone quoting the former is either someone who believes Facebook posts and clickbait headlines as completely true, or are deliberately trying to muddy the waters