Strange parenting observation

Maybe it's just me, but I noticed something over the weekend with all the teachers I had to deal with:  those that had sons, or only sons, were much more brusque and had less of a sense of humor.  Those with only daughters were kind, compassionate, helpful, and willing to let things slide.  It must just be the people I was with, but I thought it was interesting (since I knew their backgrounds too).  What have been your observations about parents with boys vs. girls?