I just read an entertaining yet insightful post from one Owl Jones. It's about some tips for new bloggers, and people interested in starting a blog. To paraphrase (and simplify) him, post things and eventually someone will become angry, spiteful,, mocking and downright mean.
I'm going to add to this. If you blog or do anything that the general public will see, you will piss some people off. And they will let you know. Many times at great length; to the point you wonder what they did with their time before find you.