why do people think that a psychic is a bag of tricks?

So I was talking to someone I know for years, well met them quite a few times over the years. So we are talking and I tell them I Psychic. She says "you think so or know so? " I answer "I know so". She says "who did my father work as?" Now I thought she was asking me abut it and not trying to test me. Either way, why do people think that just because I "CLAIM" , LOL, to be a Psychic, that I will know everything about everyone. Don't you think that would be G-D, not me. Please stop asking Psychics to tell you something about you. Pay attention to how they talk to you and what they say, they will talk intuitively.At times the person might just be tired and not interested in reading you. In fact, does a lawyer give free advice on the street? I don't think so either.