Sorry, I probably really misread you. I also read the article again and personally I don't think the situation sounds that threatening - there were a whole bunch of people there, including a good male friend.
Nevertheless, "she could have said something" is of course not an excuse for rude behavior. I wouldn't want to excuse his behavior. As I said, if I knew him, I probably wouldn't like him much and certainly wouldn't encourage him to attend further meetups.
Ok. I am a big, intimidating looking guy (or so I've been told). Next time I see you, how about I just go ahead and put my hand on your waist, lead you to a chair, sit you down next to me than put my hand on your leg while saying shitty things about whatever group you might identify.
Nevertheless, "she could have said something" is of course not an excuse for rude behavior. I wouldn't want to excuse his behavior. As I said, if I knew him, I probably wouldn't like him much and certainly wouldn't encourage him to attend further meetups.