I can understand the confusion. After all, it's not entirely uncommon for the skytrain to smell like a public washroom. However that doesn't change the fact that it is not one. Now I suppose that just because I personally don't like to leave my house without my face on doesn't mean some people won't take advantage of the extra few minutes of sleep by doing their makeup on the train. I can accept this. It's a relatively contained process that's not loud or particularly messy and it doesn't result in bodily debris being strewn around the skytrain. But then there's the hairbrushing. While it's still not the worst of the offenses that fall under the "keep it in your bathroom category", it does break transit rule #4 (http://buggedonthebus.blogspot.ca/2013/11/pieces-of-you-transit-rule-4.html?m=1). So regardless of how clean and lice free her hair appeared, I really didn't need locks of long ginger hair from the girl sitting in front of me all over my backpack this morning.
Just say no to sharing yourself with others on public transit...especially without their consent (or really even with their consent, but that's another post).