I've written before about how women tend to treat those to whom they are close much worse than they treat complete strangers. This, of course, is one reason why female friendships seldom tend to last as long as male friendships do. I've never quite understood myself why women will make the effort to get all dolled up for the office or a girl's night out, only to swap it all for a bare face and the usual sweatpants when they get home in order to ensconce themselves in front of the television more comfortably.
I've also noticed this behaviour. It's thoroughly reprehensible.