A visor is a hat that forgot to wear pants. It has given up, has no respect for others or itself and is the moral equivalent of a human wearing a hat in a restaurant.
Judge John Hodgman is NOT happy with visors, as he makes clear in his New York Times columnette
(Incidentally, His Honor and I will be touring the eastern seaboard and London, England next month. I will be wearing a special bailiff’s outfit. Dates and links are here.)