April 3, at the White House: “The C.D.C. is advising the use of nonmedical cloth face covering as an additional voluntary public health measure. So it’s voluntary. You don’t have to do it. They suggested for a period of time, but this is voluntary. I don’t think I’m going to be doing it.”

“I just don’t want to be doing — I don’t know, somehow sitting in the Oval Office behind that beautiful Resolute Desk, the great Resolute Desk. I think wearing a face mask as I greet presidents, prime ministers, dictators, kings, queens — I don’t know, somehow I don’t see it for myself. I just, I just don’t.”

May 21, touring a Ford plant: “I wore one” — a mask — “in the back area. I didn’t want to give the press the pleasure of seeing it.”

July 19, to the Fox News host Chris Wallace: “I don’t agree with the statement that if everybody wears a mask, everything disappears.”

Aug. 13, at the White House: “My administration has a different approach: We have urged Americans to wear masks, and I emphasized this is a patriotic thing to do. Maybe they’re great, and maybe they’re just good. Maybe they’re not so good.”

Sept. 7, asking a reporter to remove a mask while asking a question: “If you don’t take it off, you’re very muffled.”

Sept. 29, making fun of Biden at a presidential debate: “When needed, I wear masks. I don’t wear masks like him,” he said of Mr. Biden. “Every time you see him, he’s got a mask. He could be speaking 200 feet away from them, and he shows up with the biggest mask I’ve ever seen.”

Here's something Trump re-tweeted making fun of Biden for wearing a mask: https://twitter.com/brithume/status/1265045009323241472

And yes, to anyone in the real world, a leader saying he won't wear a mask and making fun of others who wear masks absolutely does discourage those who look up to him from wearing a mask.