What's you most hateful reply?

When I was younger (emotionally, intellectually), I would occasionally give distasteful comments to those I disagree with, and I've found that it does nothing but hurt. It does not lead to an intelligent conversation, it does not lead to a mutual sharing of viewpoints, it simply destroys. I only give constructive criticism now.

I've never really been hurt online, there's not a lot people can say about me that I would feel poorly about.

But to prove that kind comments are better, I recently had a discussion with a woman over the Union business in Wisconsin. It started rather calmly, I engaged her, stating my side, and naturally, she came back and began stating her side of things. I was calm, and cool about it, but after a few posts she began ignoring some of my statements, and taking the ones she did respond to out of context.

Now I had two choices there, I could have been an ass and called her out with callous obstinance, but I didn't. Instead, I complimented the intelligence she had shown to me so far, and asked politely that if we were to continue the discussion, I would greatly appreciate it if she showed me the same observance of context and point as I was showing to her. And from that, we continued, and eventually ended the conversation peacefully. And, from that one statement, I showed her that I was more interested in discovering the truth through intellectual conversation, rather than attempting to prove my point at all costs.
In my opinion, that opened her up to the same wish, that instead of throwing weight around, we would pursue fact through logical discourse.

The problem of course is when you deal with a person that is not capable of that kind of intelligence. And it's probably best to ignore a person that shows you that kind of blatant unfriendliness.