I was at NANOG 20, and I seem to remember that the technical talks were over
a good 20-30 minutes before Beer and Gear. If people were leaving the talks
early, I'm sure it was not the fault of the vendors. I certainly don't
think that people should have been offended by it.
The vendors set up early and left their stuff unattended. The supply
of particular trinket was pretty much exhausted by people leaving the
talks 20-30 minutes early to ensure their possession of that NANOG's
As far as being "sexist", I know more women that wear boxers than men.
The boxers were not the issue, despite rumor to the contrary.