Understanding vs not understanding

Since when is it some sort of "crime against others" for me to not understand something?

I've been involved in a discussion on rape on city-data. The discussion was supposed to be about what kind of 'responsibility' a woman has to protect herself from rape. Smart things to so and not-so-smart things they should maybe not do.

Yesterday, I replied to a post about single girls dressing alluringly and heading to their neighborhood bars. All I stated was that I had never done so and that I really don't understand women who would do so. And I really don't understand why any woman would wear skimpy clothes and go into that kind of environment. Especially going alone.

Instead of explaining it, all of a sudden everyone there was attacking me, claiming that I was attacking other women!