I guess its the little things that bother me the most. Like the difference between cement and concrete. I suppose that when you work in a world where everything is abbreviated (ever try to read a drilling report?), you become sensitive to someone trying to change those abbreiviations.
Concrete is made of cement and aggregate (rocks). The bulk is aggregate. The cement holds everything together. Kind of like the marshmellow in a rice krispie treat. You don't look at a rice krispie treat and say ohh a marshmellow, just like you shouldn't look a sidewalk and say its cement.