I overheard this conversation today and made me laugh. Mask user: You there! Where’s you mask? Teenager: I am scared to wear one in case I can’t breath.
Mask user: Don’t be stupid. Of course you can breath with the mask on. Fucking idiot. Teenager: So you can breath when the mask is really tight round your mouth?
Mask user: That’s right. No problem. Teenager: Then if the air can get through, how is the mask supposed to stop a virus?
After a few seconds while the mask user contemplates this response the teenager follows up: who’s the fucking idiot now then? And casually walks off ????
Here's another idea, use your lips and make the kiss motion as if, be sure you're looking them in the eye and wink too. Make them real uncomfortable for getting in your business.