We all have done it. We've posted something in the heat of the moment, whether it be anger, hurt, sadness...and come to regret it later.
I like to think I've gotten better about it and have been proud of myself for pulling away from the enter key. There have been times I've read a blog post or Facebook comment, Tweets too, and really wanted to speak my mind or defend myself, but didn't because it wasn't worth the fall out that would come after. But sometimes my fingers still operate faster than my brain. I hate when it happens. And there's little you can do to fix it afterward, other than offer an "I'm sorry" and an explanation of not distancing myself before typing away.
I try not to be a hypocrite, but it happens. I think it happens to everyone now and again. And most times without even realizing it. I'm not perfect. I make mistakes. All I can do is learn from them and try to be a better person in the future.