Well, Adria's posting of the picture without consent was itself a violation of PyCon's code of conduct. Frankly, it's hard to understand her position when she made the same kind of dick joke on Twitter in public to a friend where everyone could see it.
As it is, we have a situation where someone who makes dick jokes to her friends overheard someone else making a dick joke to a friend and intentionally shamed them by posting their picture on the internet. Clearly, this action was the catalyst for one of them getting fired; it was her goal to make an example out of these two and embarrass them on an internet scale.
Her self-righteousness belies the utter insignificance of what actually occurred. Comparing herself to Joan of Arc and claiming she "did it for future generations" doesn't help. On top of angering a lot of men and women alike, her behavior struck a nerve and has the potential to leave a bruise on gender equality in tech.
One can be in favor of equality and yet have the intellectual capacity to examine situations on a case-by-case basis and determine that this was a contradictory overreaction on her part that had undeserved consequences for one of the men.
> Since when is Twitter the same thing as a professional conference?
First, she mentioned PyCon in that Twitter conversation. If she had hashtagged it, there would be a stronger argument, but either way we might say she's having an "inappropriate conversation" in the "vicinity" of the conference. People searching about conference might see this, just like people at the conference might have heard the same inappropriate joke.
If we look deeper I think "but she made similar jokes" has other merit. What's the point of having "professionalism" rules at a conference? Because everyone is there publicly representing a company, and because they don't want distractions from the purposes of the conference.
Adria is a public representative of her company, and apparently uses her Twitter account in connection with that. Why does she get to mix her personal life into a public-facing account, complete with "overhearable" unprofessional jokes, but two friends in the same room with her can't do the same?
The only good reason I can think of is "because the conference rules say so, and they all agreed to them." Any other reason for her getting to be offended about a joke quietly exchanged between two well-acquainted professionals but overhearable in public, is hypocritical, because she set up the exact same situation on Twitter. When you consider her inappropriate, overreacting, passive-aggressive response, and calling them "ass clowns" on her blog (it's at least partially profesionally-oriented, by the way), it just gets more frustrating.