One is you really don't know the person as well as you think you do and that person knows it. When the person in question, when they are saying this to you, are making it clear that you need to stop making assumptions about them in the particular situation being discussed.
STAI LEGGENDO
You don't know me
Saggistica"Don't try to explain yourself to people, if they don't get you, they don't get you."
