I mean, PyCon had a Code Of Conduct. If you don't blame the organizers for sticking to the published code, then how does Adria get blamed for doing the same? Doesn't that strike you as getting mad at her for "tattling"?
On the other hand, if you think the Code itself is bogus, then why don't the PyCon organizers get a share of the blame for a bad policy?
As it stands, the complaint was made via a publicly posted picture on a heavily followed twitter account.
Everyone has the right to feel uncomfortable and try to alleviate that discomfort. Knowing of the Code of Conduct, Adria's decision to bring that to the PyCon Organizers attention is certainly a reasonable action. I think your parent comment thinks that regardless of how the PyCon Organizers were notified, they did the right (or at least acceptable thing). The parent comment suggests that they don't agree with Adria's method of contacting the organizers.