I read an article today about Blog Commenting Tips. I found this interesting because of the mean spirited comment that I had in the past on my blog.
I try to make my comments on other blogs constructive and encouraging. It's rare that I am negative in a comment, and in the times that I am, I also add something positive such as "I like your blog generally, I enjoy it a lot and continue to return to read it, but today I completely disagree with you....." However, I never make a personal attack on someone. If I don't like what they have to say, I just stop reading. I don't have to go there. I can post my disagreement, and if they respond with a personal attack instead of an intelligent conversation, then I don't bother going back. What I read is my choice.