If you're a journalist, you're supposed to report on the news and affect it as little as possible. Since the Gizmodo people consider themselves journalists, I'm sure most the bloggers there thought they were as well.
So when all of these people clogging the air with WiFi cause a demonstration to be ruined, I expect Jobs to be miffed. It would be the same as if someone had a watch that was shooting a glare at Jobs' face or if someone had a cell phone that kept on ringing throughout. These people could've complied like grown-ups and posted something FIVE MINUTES LATER (gasp!) instead of ruining the presentation. The Macworld bloggers were acting like a couple of college kids being told to cross the road at the crosswalk.