I had this discussion with friends. We bought masks with teeth or skulls painted on them for fun and were once walking around a shopping center and some people were acting pretty weird around us, like they didn't know what to expect. In a normal situation, if you were approached by people in creepy masks, you'd be scared and expecting some aggressive language, but in these strange times, where we have to wear masks, people are starting to ignore them. So, last year if you came into a jewelry store with a mask on you'd see everybody tense up and demand you to take it off, now, nobody seems to care.
Another interesting thing that I've noticed is people are really staring into my eyes because they can't see any other expressions. They don't know if I'm smiling or frowning so they watch the eyes more carefully to know what to expect. Masks can have their benefits if you aren't too tense and able to have some fun in every situation.