But "judge not" is like their favorite verse! 

 I usually hear it from people who know what they are doing is wrong.  It's the only part of the Bible some know lol 

 I don't think those verses relate to judging another very well.

See: Matthew 7:1-2, Luke 6:37, Romans 14:10 and one of my favorites John 8:7 

It's clear. Judging another is not our place  

 This is a simple lesson, but there's people that don't understand it at all!
Btw when Bible taught us not to judge, it's pointing out certain kinds of judgements, not prohibiding all of them.