eta: AKmom is right - in some cases it is perception. As Jo is right as well...calling them out in private is better...
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yeah. I have known people who claim "victim" and embellish the story to make them appear a tad bit better....then when people ask questions or for proof? They can't produce it....so people start wondering about their stories....
There are people who tell lies about others - with their purported "truth" - and eventually - the truth comes out and when it does - those that told the lies claim they never said that, don't recall saying that, or blame someone else because they heard it from someone they "trusted".
Do I call people out on it? Yep. I'll do it publicly as well as privately. Depends upon who it is an the situation.
If you have people like that in your life? You need to "chip them away" - all it will do is cause you heartache, doubt and pain. you know the real story. Stick with it. Stay away from those who love to lie about others...or worse yet...use the lies to build themselves up and have no remorse about what they have done.
Good luck!