My response has usually been, "I'm sorry you feel that way." or "that isn't the way I remember it", or some variation like that. Not getting into a "Did not!" "Did too!" type argument.
formerly known as "shelbel" Me 40, stbxh 40 DSs 9, 7 & 3 M9, T10 Stbxh is a diagnosed bipolar & an addict. The end.