Bus woes

Just got back from work on the old number 7 bus. One didn't show up at all so I had to take the next one, which was soon packed to the brim with people keen to get home. Of course a girl sat next to me, proudly showing off her oral fixation and using her teeth to groom her fingers and nails. Why is this such a common trait of so many women and girls. They play with their mouths in public and think it's perfectly normal. I find it obscene to have to listen to their nail-biting routine set to a saliva soundtrack. Oh well. I'm home now so not to worry!