Charles Barkley, Madonna, and innumerous other pop culture icons are purposefully and in some cases ignorantly misquoting Jesus to Christians. Its not exactly a misquote, but it is definitely taking his instruction out of context. This verse makes it clearer.
John 7:24 "Do not judge according to appearance , but judge with righteous judgment ."
Here is a video of a pastor saying it much better than I can. Here's to defeating this ignorance.