@Glennn,
I'm not so sure, I don't think he called individuals stupid, I believe he was reminding members that it's stupidity to allow yourself to be baited into responding to pestiferous folks who are unbalanced or just annoyingly maladjusted. I certainly don't have the patience of a Saint, and I have stupidly allowed my annoyance with boneheads to override my better judgement. So, I know it's stupid because all it does is reward lightweight simpletons as if they matter and encourages them to continue...but, but, but I have snapped at simpletons in the past, and in the fairly recent past and it sure as hell wasn't a smart thing to do. (for reasons as described above)
Bottom line for me, sometimes it's helpful to be reminded to do the thing you know is the right thing to do..