Probably nine out of ten people wearing a mask in a car
are women.
The main reason is that they have fixed their hair and put
the mask on in front of a mirror so it's all perfect.
Women can be pretty particular about their looks.
Guys, not so much.

Since shedding is a real problem, wearing a mask might help.
I wouldn't count on it though. Staying anti-social has worked for me so far.