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.
I appreciate that PyCon has a good policy and applaud all conferences that make an effort to make their conference a safe place. Through a mix of official (staff) and community enforcement (tweets/public outcry), one day it will be truly welcoming and all members will live up to the code of conduct.
'Be careful about what you say when at PyCon. Otherwise someone might hear you, report you to the authorities and post your photo on the internet resulting in you losing your job'.
And she broke the CoC by posting a picture of the people in question with a derogatory statement on twitter. Thats far worse than the joke they said to themselves.