We all adapt ourselves to different social situations. I think it's a necessary tool for survival, regardless of anyone's opinions on honesty and deception. Sometimes we have to blend, impress, stand out, make nice.
Even without the obvious social cues that prompt this adaptation, we would naturally disguise certain personality quirks in different situations. In my case, I'm always two completely different people at work and in the social world.
When I started my new job, I got the nickname of the "quiet one." Now if you told all my friends this, they would never, ever believe you. They would roll around laughing at the mere suggestion of me being remotely quiet. But at work, especially a new job, I am shy, reserved, and polite. Outside of work, I am...not.
But these traits are important to the settings we find ourselves in. If I was loud, blunt, and crazy at work, my boss might not take me seriously. If I was timid and quiet with friends, we wouldn't have so much fun. So I say: wear your disguises proudly! It's always fun to be different people.