Robert, this has happened to all of us at one time or another. The points are real subjective because there are no real guidelines for giving them or taking them away. So each time you comment about something you run the risk of getting negative feedback.
If I remember correctly there was a guy who had a rep of about 10 and almost overnight it went to a -15 or so. Then he retaliated and gave many of us negative reputations. Why do I say all of this? Because losing a point or 2 doesn't really matter. You'll gain them back as you continue to provide good info on this site.
Most all of us really appreciate you.
Shaun
P.S. I think this subject has been the second most controversial thing on this site. (Decided the most controversial thing didn't need to be said, so I deleted it.(Shaun))