Man is least himself when he talks in his own person. Give him a mask, and he will tell you the truth. -Oscar Wilde.
In our lives we were different masks when dealing with different people. Sometimes culture forces us to do that, and sometimes it's simply a habit, I won't title it as good or bad habit, just a habit.
In the matter of truth, sometimes it is the hardest to fitch. The definition of truth and honesty is not as wide spread and lies and manipulation. Lies are easier to form, and the truth is harder to tell when you could just tell a lie and get it over with.