Lesson 1 : Repeating Lashon Hara that is common knowledge- is the same thing as saying lashon hara for the first time or in secret. doesn’t matter if its well known or not.
Lesson 2 : People often think its okay to do...Even if the speech was bad or content was simple. It is considered Lashon hara to mock or ridicule the speaker. Your opinion is subjective - and even if you didnt like what was said - others may have. the speaker can have a great influence on someone else.