I think stilettos are one of the most stupid things ever invented because they're not good for your feet or your spine. When I did wear them, back in the day so to speak, I always dreaded getting them caught in some grating somewhere. Now that comment is not that biting, I feel, but some of my characters do come out with very pointed remarks at time - and rightly so. It is part of their personality to do so and the situations they face also justify pointed criticism.
So what kind of biting comments would your characters make? What would drive them to be like that, or are they like this all the time anyway? How do the other characters respond? What kind of conflicts can you get out of this to drive the story along?
Have fun finding out!!