At the start of all this, I saw someone point out that in Japan, where mask-wearing is more of a thing, their emoticon for smiling is ^_^ while in the US :) is used. One emphasizes the eyes, still visible with a mask on, the other the mouth. (Note: I am not an emoticon expert, let alone a cross-cultural one)

Given the number of women I've seen happy that no one has told them to smile during this pandemic, I guess a lot of folks in the US don't know how to tell when eyes are smiling.

Exactly the eye areas of regular humans (non-sociopaths) are very "vocal" as to emotions if you are paying attention.