Debugging conference anti-harassment policies

You're looking at this in the wrong direction. It's not "Are there companies where this kind of behaviour is unacceptable" - it's "Is an arbitrary company likely to consider this kind of behaviour acceptable". In the majority of the western world you're unlikely to win a lawsuit for constructive dismissal on the basis of being exposed to coworkers being allowed to drink alcohol in specific social situations. Unless you've explicitly chosen to join a company where exposure to sexual imagery is acceptable, an analogous situation would probably result in significant damages.