So true. In a similar but infinitely more serious vein, men often don't hear about women's experiences of violence at the hands of men. Unless you're a particularly approachable man, you might, like me, be surprised at how many women you know have been touched by this problem.
I'm not sure if this statistic is global, but for actual abuse, one in four women has been a victim. If the rate is so high for close-up abuse, you can imagine how it will be when you add online anonimity to the problem.