On a subway ride a few months ago, a man came and stood a few feet away, staring at me. He asked politely why I wasn’t wearing a face mask. I replied that they weren’t effective and could be harmful.

“Oh, so you know better than the rest of us,” he replied, his voice getting louder.

“I can give you some information if you’re interes…”

He interrupted me by shouting an expletive over and over, adding a gesture to bring the message home.

He held his pose long enough that I was able to draw it from memory a few days later.