All PyLadies events (Meetups, conference lunches, etc), online spaces (IRC, Facebook, etc) are beholden to the PyLadies Code of Conduct.
Every PyLadies location is required to make Code of Conduct public in some way. For instance, PyLadies SF has a dedicated page on their Meetup space. The #pyladies IRC channel on Freenode has a link to the main website’s Code of Conduct in the topic of the channel.
Please read Responding to CoC Violations for how to appropriately deal with CoC violations.