Yeah, it was against the code of conduct. And they were members of a large audience. Not sure how either of those facts make it a big deal. PyCon's response was appropriate.
it's not an outrage she spoke up. she overheard an inappropriate comment and proceeded to publicly drag these guys' reputations through the mud. between the two actions (private, inappropriate comments in a public space, or calling out the pitchforks), her action was clearly worse, and in real terms more damaging.