Some owners use bumper stickers to distance themselves from Musk. In recent months, Tesla vehicles and showrooms have become targets of violent attacks and widespread vandalism, ranging from ...

The most popular of the items that he sells? Bumper stickers that say, in all-caps, “I Bought This Before We Knew Elon Was Crazy.” For his vacation, Mr. Hiller asked a friend to cover for him.

“Up with EVs, down with Elon.” That’s the message on bumper stickers a D.C. resident had printed to put on her Tesla and give to others. As the political climate seems to grow more intense ...