"Judge Not" - What does that really mean?

Matthew 7:1 is perhaps the most oft-quoted verse in this postmodern era: "Judge not, that you be not judged." But does that verse mean that we can't call sin ... sin? Or that we can't confront false teachers? Or even that we can't try to discern what is best from what is merely ok?

Check out this 2-minute explanation from John MacArthur: "Judging Others: The Verse Pagans Love to Quote."

What do you think about MacArthur's explanation? Agree or disagree?

*P.S. You may also be interested in MacArthur's answer to the question: "Why Did Jesus Forbid People from Making Him Known?" His answer is well worth 2 minutes of your time.