I'm not entirely sure you can tell if this group was biased or not with this one interaction with them. As you mentioned: > I also don't think they'd have sat

I'm not entirely sure you can tell if this group was biased or not with this one interaction with them. As you mentioned: > I also don't think they'd have sat there, chattering away, if a man had used the same framing story (father and son, father and daughter). If you didn't observe them sit quietly for a talk before this given by a man, who's to say they didn't just do this to every presenter (man or woman) for the whole day until you told them to knock it off? I've met plenty of people who got their kicks from being loud when someone else was supposed to have the stage, and who it was didn't matter. It's not that I don't believe in anecdotes as helpful reminders to be better people, but I'm not sure this is a great anecdote for your point.