And if you're not comfortable confronting them in person, tell conference staff, who'll talk to them. In fact, PyCon staff did talk to them, got an apology, and sensibly decided that was that:
http://pycon.blogspot.co.uk/2013/03/pycon-response-to-inappr...
No. The appropriate first course of action upon being personally offended is not to passive-aggressively take a picture of perceived offenders and create a vendetta on Twitter; rather it is to turn around, confront what/who offended you, and deal with the situation like an adult.
Further this person's "shaming" was an abuse of her professional privileges and that alone warrants her firing.