Earlier quoted context omitted.
Hi, Jess. I spend time in gay bars too. I also like them, and have never felt uncomfortable there. But elsewhere I was once hit on in a way that made me feel unsafe. It's not fun. I'm glad that hasn't happened to you. But if this particular scenario doesn't help you to understand how you you might feel unsafe in a sexual context, go ahead and make up your own.
I'm sorry that happened to you. Even so, I wish you could see that the scenario you've described is not helpful for many people who are trying to imagine feeling unsafe in the situation the woman describes: a full auditorium, two dorky bearded dudes in a sea of dorky bearded dudes, and the sort of mindless unconscious chatter in which people engage while they're waiting for the windbag conference organizers to get to…
I am saying that one reason we don't make sexual comments in professional contexts is that it can make people feel unsafe.