One thing we can all do: Start asking before you touch in situations where you know you don't have to. I know it's awkward. But the reason people like Joe think they can put their hands down someone's pants is because we don't have a cultural practice of "ask first". They see you put your arms around that friend of yours who doesn't mind at all, and they think "Ah, cool... so you can just sense if she's cool with it…
Start asking before you touch in situations where you know you don't have to. I think this is based on incorrect understanding of the real cause of the problem. The problem was not the lack of knowledge about the fact that she was not consenting - it was clearly apparent to everybody else, she did not need to verbalize it. The problem was that he was not able to perceive her obvious signals or did not care about them…
But it also needs to be said, that a technical conference isn't the right place for heavy drinking or "body shots". It's just unprofessional.
I think what we need to change is not only attitudes towards sexual harassment, but also towards professional behavior at conferences. Which means drawing the line much earlier. Nobody should ever feel they need to do heavy drinking or "body shots" in order to be "accepted" into the community or "bond" better. That includes both sexes, I know men who do not like to drink, but do so in order to "bond" with the community.
Disclaimer: I am not explaining or justyfing anyone's behavior here. What was described in the original article was unacceptable by any means. So please don't go off with a knee-jerk reaction to this post, but think about what I really mean.