I remember reading an article in Bicycling about 20-25 years ago where the writer was describing a "Fred" (not the term he used, though) he encountered on his ride who was wearing BLACK socks. Cuz then white sox were fashionable, so black socks were the faux pas.

Mr. Black Socks kicked the author's butt, so he was appropriately chagrined for judging someone based on their appearance.