As I said, I understand defending your turf (ie your job, online community, whatever). However calling out men really does nothing. I don't grope random girls in bars, so I have no idea how I am supposed to react to your post. Obviously would I encounter unpleasant behavior towards women, it would be a different thing. But I rarely do. Also I think for the groping incident it was pointed out that it is illegal, so I suppose had the groper been known, there would have been consequences already.
It's true that from the beginning men don't understand the problem. But after a while you can learn, and occasionally you get a homosexual approach. I understand how it can be uncomfortable to be desired by a stranger. Unfortunately I think it is partly in the nature of things. Women are "the price" and hence men have to hunt after them. Men are pretty worthless biologically (simply because it takes less men than women to create lots of children).
That doesn't excuse disrespectful behavior, of course. But it is a biological reality that at least men have to do a lot of approaching, and women will not always like it (it shouldn't be groping, but I hope you get the idea).
I don't understand your issue with the voting: this is Hacker News, and the offending comment was quickly removed. If Reddit doesn't work out that way, perhaps don't hang out on Reddit? That is what I mean by avoiding jerks. Personally I probably wouldn't enjoy Reddit either because of the jerks. But you can not convert any and all environments, or at least, if you want to try, good luck! I don't think jerks can be eradicated. I can only say it works well for me: I hardly ever encounter jerks, and I don't think any of my friends would grope women in a bar. I could make my life miserable by thinking about the millions of jerks out there, but why bother?