What does appearances are deceptive mean?

Answer 1

What someone looks like does not always tell who they are. One common example would be a guy with long hair. Many people will assume he is a pot head or drug addict, but while in some cases it will be true, in other cases he may be keeping his hair long for cultural, spiritual, or personal reasons, and not do any kind of drugs. A gal who wears tight fitting cloths that show every curve of her body will generally be seen as a slut, but in some cases, she may not realize that's how people are looking at her.