If you have many readers, you'll eventually get some nasty comments on some of your posts. What should you do about them? You could delete them, of course, but a blog with no negative comments feels sanitized and unreal. Real life isn't that way; reasonable people sometimes disagree… and there are lots of unreasonable people out there as well.
Here's one example… check out the comment above that someone left. As you can see, I left the nasty comment up and replied to it. I did my best to respond in a way that was gracious but firm. This is the best way I know to respond to online unpleasantries. What's your policy on rude comments?