Vivian wasn't sure exactly when she became cynical. She just was. Why couldn't she consider that a part of herself and just accept it? Why couldn't it be like how some people prefer baths to showers? Or milk chocolate to dark? Why is it that we're only allowed to accept the parts of our personalities that are easy to swallow?
And, anyway, her cynicism was the only thing people noticed about her, so how could that not be a good thing? Paired with her sense of humor, it was a force to be reckoned with. Seriously, if Vivian had a dollar for every time her wry observations got her laid, she'd have eight WHOLE DOLLARS. Which doesn't sound like that much, but how often has YOUR move gotten you laid? Yeah? So SHUT UP.