Wearing a mask when you’re driving alone is like wearing a condom in bed by yourself— Kevin Sorbo (@ksorbs) March 19, 2021
Some people forget to take their masks off after they get back in their car. I do that sometimes. At other times, I put the mask on before arriving at my destination so I don't forget to put it on before exiting my car which is something I've done a few times.
But the chief reason I might wear a mask while driving alone is that I'm driving between two or three locations and, at each, I'm required to wear a mask. For example, going from the grocer to the pharmacy to the cleaners. Taking off and re-donning the mask between stops risks contamination of the clean side of the mask. If my tasks are relatively quick, rather than use a new mask, I leave it on between stops.
My reasoning might be incomprehensible to someone who would take off a condom after sex, and try to reuse it a second time.
Of course, the real reason Sorbo is posting this is that he's an anti-masker. Any opportunity to ridicule someone wearing a mask is an opportunity he won't pass up. I also suspect that people who are opposed to masking might not even try to figure out why someone is wearing a mask while driving alone in their car.