The new coronavirus knows no national borders or social boundaries. That doesn’t mean that social boundaries don’t exist.“En route to Paris,” Gwyneth Paltrow wrote on Instagram last week, beneath a shot of herself on an airplane heading to Paris Fashion Week and wearing a black face mask. “I’ve already been in this movie,” she added, referring to her role in the 2011 disease thriller “Contagion.” “Stay safe.”Paltrow did not pose with just any mask, unlike, say, Kate Hudson and Bella Hadid, who