In terms of an alcoholic relationship, it is like when you call them on a promise or an agreement that you came to, and they insist that you heard them wrong, or the discussion never happened. Or if you recount an incident of abuse or neglect, they insist it wasn't as bad as you say it was, or the details are different or you are just making crap up to give them a hard time. Stuff like that.
Exactly. Or when they insist that the ONLY thing wrong in the relationship is you. LOL.