It is an old cliche to not judge a book by its cover. And like many others, I take exception to it. In its usual application for people, it makes the least sense. A good book may be given a bad cover by a bad publisher, but in general people usually have to be judged, at least temporarily, by their ‘cover’. In almost every situation, you are required to act upon what you think of the people around you without anywhere near enough time to develop a nuanced and non-superficial view of these people.
There is another way that this is flawed as well. Look at this picture, this cover of a man.Sometimes you don’t read the book because the cover is revolting. And that, I believe, is perfectly reasonable.