The Maharal says that if one speaks disparagingly of another it is NOT Lashon Hara if said in his presence!!
Q: The Medrash says that Miriam spoke Lashon Hara about Moshe in his presence???
Why is only speaking negatively of another called "Lashon Hara" and not Nivul Peh, Leitzanus etc. which are also "evil speech"?