If she was feeling that they were being inappropriate, there are other ways to handle it. I'm not a fan of naming and shaming without trying to handle it privately first.
Such as me saying I find the use of "chick" in that way to be unnecessarily derogative, but she really was out of line in my opinion.
I fully support her in calling them out publicly. Quietly informing the authorities does little.
As an aside, every PyCon attendee agreed to a code of conduct during registration, and the conference staff are available to address and remedy violations of that code.
You have a truly strange concept of welcoming.
I don't police their conversation, any more than I would like them to police mine.
I don't like passive-aggressiveness. I spent a lot of my life being passive-aggressive and always wondering why nothing ever changed.