In an unhinged, borderline satirical rant that almost impressively strays from logic, reason, science, and basic human decency, Carlson compares wearing a protective mask outdoors during the COVID-19 pandemic to children being punched in the face before they head out to recess. The clip also has Carlson associating mental illness with liberalism, but it's probably healthiest for us all to only unpack one ridiculous theory at a time...
While it's true that COVID-19 does not spread as easily outdoors as it does indoors, as of April 19th, the CDC still recommends wearing masks outdoors when social distancing is not possible. Crowded parks, outdoor events, or gatherings between different households are all examples where masks are more useful than "this grotesque version of Halloween," as Carlson so gently puts it.