What do you think of people who

suddenly come at you for something unsettled by them a long time ago?  I mean like there's something you did and they never really did anything about it.  Like, then, later it matters.  Of course, it's not something that you started.  It wasn't anything too bad in some ways, considering how highly suggestive the thing was that caused you to react the way you did.  People seem to have a hold on that you should never think they're wrong or something, secretly.  How do you do that?  Just ignore it, I guess.