Violists don't like to be made fun of and therefore find ways of making people feel sorry for them. They wear shabby clothes so that they'll look as if they've just been dragged under a train. It works quite well. People who play the cello are simply not good looking. Most cellists are in analysis which won't end until they can play a scale in tune or, in other words, never.
Cellists wear sensible shoes and always bring their own lunch.
Double bass players are almost completely harmless. Most have worked their way up through the ranks of a large moving company and are happy to have a secure job in a symphony orchestra or anywhere. Harpists are gorgeous. And they always know it. They often look good into their late eighties.