Isn't it a sociopath that blames everyone else for their own screw-ups and errors?
Sociopaths are people who have little to no conscience. They will lie, cheat, steal and manipulate others for their own benefit. They know exactly what they are doing, they just don't care because they don't think that way. If you are naive enough, they will brainwash you into doing exactly what they say and what they want which is the only time a sociopath is truly happy.
Sociopaths can hide this well if you haven't known them for long. They're really nice and charming at first, almost too nice, but it's extremely fake. The niceness will last until a problem occurs in which they are at fault however, you will be manipulated to believe that you are in the wrong. There is no reasoning with this person. Things have to be their way or it's the highway. They will blame you for hurting them (even if they're the ones who hurt you) or blame the world for all their problems (knowing full well they do shitty things in general). They are compulsive liars and even if they do apologize, it's never genuine. Most are anti social and have few to no friends because most people around them don't want to associate with them. However the sociopath will again tell you that "people hate me for no reason/the world is against me". The only person who will put up with a sociopath is someone who is off their rocker or someone who has absolutely no self respect, or both of those two combined. prom gowns with ruffles
Piece of advice: Once you realize that you are dealing with a sociopath, RUN.