Sexism and terrorism

Via friend, I just read this lady's account of her dreadful experiences in the gaming community. It's impossible to think that this is an isolated case if you read it. It is a horrible thing to read, and I can't begin to imagine how much worse it is to have lived it. Why men would treat women like this is quite beyond my capacity. The whole account can be read at the link below, but here is a flavour of one of the lady's mildest experiences:

I am thirteen years old and in a game store for the first time. I examine their selection of dice and take them to the counter to pay.
“How old are you?” asks the balding, middle-aged man behind the counter.
“Thirteen.”
“Old enough to bleed, old enough to breed!” he chuckles in glee. The Warhammer 40K gamers at the table behind him take up the refrain. “Old enough to bleed, old enough to breed! Old enough to bleed, old enough to breed!”
I run.
http://latining.tumblr.com/post/141567276944/tabletop-gaming-has-a-white-male-terrorism-problem

Please, if you see the cruelty she describes in her piece happening, oppose it.