AFAIK this is the penis joke she made:
http://i.imgur.com/1ND42rS.png
Whether or not you're into penis jokes it's, IMO, worth making a distinction between a talking loudly at a conference and a twitter mention. IIRC, her twitter post was semi-private, being automatically visible to the intended recipient (and potentially mutual followers) but nobody else. Someone could see that she posted that, but they'd have to go looking. Not only that, but twitter is a medium for both professional and casual postings. OTOH, if you're talking loud enough to be overheard in a crowded conference hall that's far less private, but is typically intended to be a more formal setting than twitter. From what I can tell, she wasn't eavesdropping, but the two guys were being loud enough to be disruptive (regardless of whether the topic of their conversation was appropriate or offensive).
Look, I enjoy a good penis joke... but I you know what? I'm a guy and I get tired of the frat house / Bevis & Butthead mentality that seemingly pervades so many tech things. I went to the last MongoSF with my then-boss. At one of the talks I sat next to a woman who was an employee for a government contractor looking to glean some insight into fixing the problems they were having with their Oracle to Mongo migration. I spent some time before the talk picking her brain. At every opportunity my boss interrupted with jokes and comments that were off-topic at best. After the talk, my boss came up to me and asked if I got her number and if was going to fuck her. Is it really that hard to act in a semi-professional manner in public? Dunno, I've made a point of not going to tech conferences with my boss any longer, so. There's a time and a place for dick jokes, and a conference is neither that time nor that place.
What amuses about this situation is how much all of the free speech champions are nailing Adria to the wall for someone else's actions. Free speech is good and well unless you don't agree with it or the reactions to it, right? Right-o.