Phoney people are the worst

Do you ever come across people who are so phoney and deceptive about whatever their worst flaw is, that you honestly don't care about the horrible things they've done, just that they won't own it?
I want to shake one particular person right now and tell her to "stop being so phoney!" She feels the need to pretend so much so that she is lying about things that are common knowledge, and not rumour mill common knowledge either, just outright basic facts. Being lied to in such a transparent manner annoys me so much more than the actual behaviour she thinks she needs to hide from me. Please! Just take off the mask and own it!