It's totally fine with me too ! (in fact, I wouldn't mind if they changed clothes on the train too...hee, hee, hee......{ouch !! a slap upside the head by my little lady})

A few girls at the uni will do it in the morning classes, and that doesn't bother me either. My seminar girls, some of them, at least, will do it in my office during that period of time, and I don't mind at all...it's kind of like I am one of 'the girls' almost.

Putting on makeup is an art, and I enjoy that element, so, in fact I sometimes direct them or compliment them on a job well done. So if a girl or lady (or even a guy) is painting her/his face on the train or in public, I enjoy the work of the artist.