I'm not sure why he needed to write this. If I wrote a blog post every time someone upset me or disagreed with me, I wouldn't have time for anything else.
General piece of advice: take other people's opinions with a grain of salt. You don't need to be concerned about something just because someone else says you need to be.
(In this case, the proper response to the IM would have been "lol yeah" or something. Just make them go away, and ignore their future input.)
Ten people up voted this. I wonder how many would have down voted.