I suspect humans are a lot better at remembering abstract generalizations about what occurs than specific instances. (And probably with good reason; abstract generalizations probably take up less space.)

As a child, arguing with siblings, I had lots of arguments of the form "You're accusing me of X? But you always do it yourself!" / "Oh yeah? Name one example!" / "I can't think of any, but you still always do it!" But even if I was on the side asking for examples, I kind of knew in the back of my head that I was being dishonest, because I remembered the abstract generalization myself as well.

Of course being specific is still a good idea. It may be that the habit of being specific only helps you going forward, as you begin to get in the habit of storing specific instances.