Let's also not forget that it was a conference. A very laid back-camping kind of conference, but a conference. In today's standards - where you can't join a project or visit/talk to a conference without accepting a CoC - this would still be considered an extension of the workplace, or at least be classified as a "professional setting". We are not talking rocket science: if you are in a professional setting, getting overly drunk, make out in public and then proceeding to random groping - is NOT ok. You can have him redefine the narrative however he wants, he still a serial sexual offender.