Many Witnesses justify the judging of their fellow man by pointing out what the Bible says. If they can point to a scripture and say, "See. It says right here that it wrong," then they feel they you have been judged by Jehovah, not them. This is not justification. It is only an excuse and semantics.
Do not judge or you will be judged. There's no two way about that. Jesus condemned people judging other people. Do judge a fellow man is to encroach on the authority of Jesus.