Two-Faced ... how bad is it?

Sistah Kiki's post got me thinking - AGAIN - is it really such a bad thing to be two-faced? Those aren't her words - but she describes a dilemma that many I know live with. I am trying to capture this phenomena in my novel (that I pray will be published later this year;-). I let a friend read part of my novel and her reaction: "That's unrealistic. No educated woman speaks like that." What really cracked me up about her reaction is the fact that she and I cut up all the time and we're both educated professionals! I didn't even ask why she wouldn't believe it in a story.

So, I ask - how many of you are two-faced? Do you meet folk in one setting and they get surprised and bent out of shape when you show them another side of you? Or are U the one who gets surprised by another's multi-faceted personalities?

Addendum:
I know most use the term two-faced to mean a negative thing. But, I want to play with the concept a bit. I grew up with folks who claimed if you left the neighborhood or the family circle and improved yourself you'd gotten "brand new" and that was a crime: as the premise of the new movie Welcome Home Roscoe Jenkins seems to be. I'm not saying that we should forget our moral grounding, but I do struggle with the going back and forth sometimes. Some days, I just wanna kick my shoes off and be country as I wanna be! Sometimes, I know I need to be professional & on top of things - even FABULOUS! Then, there are times when even I caYn't STAND the folx I grew up with in all their ignant glory! LOL! So, yea - I know I can be two-faced - but not in a malicious sense.

*click image for source.