You're not allowed to hand out your own articles you've published in the journal that the conference is about? One could start questioning what this conference is really about, if authors aren't allowed to provide a copy of their work to people they talk to... No one bats an eye about that almost every paper author shares their papers with you when you email them, but when you do so in person it's suddenly a problem?
TFA makes the same point -
>The scientists were not disruptive or disorderly in their conduct, based on the videos posted by MedPage Today, although the fact that they were handing out reprints just before an NIH representative was scheduled to speak might be construed as a form of protest. But it could just as easily be argued that such actions fall under valid scientific dissemination and discussion, the conference’s stated objective.