There are those people who seem to literally embody the calmness we train in Aikido. They are quite irritating to be around, particularly when they seem able to glide through problems we find throw us for a loop. Consequently we, because of our own inadequacies, impute to them a "superior" attitude, they do not assume one themselves.
Then there are those people who are struggling to maintain a semblance of calmness by repressing their negative emotions. Such as the desire of the parent to throttle their teenager when said teen wrecks the family auto. These people are more common.
Calmness is something which requires practice and the ability to shift one's perspective. When our 16 year old daughter totalled her mother's car (she rolled it on the freeway with five other kids in it, not one bruise because all wore seat belts), she called me first. I picked her up, looked at her mother's car, gave her a hugh and told her it was good she was alive. I then called my wife and told her that our daughter had been involved in an accident and was all right -- and by the way your car is now junk. As my wife later explained to our daughter, it was good that I was there, since her first, second and third inclinations were to wring her neck.
The problem is that I am easily disturbed by silly things, which my wife finds amusing. So there you have it, in major tragedies, I am the calm one. In life's minor irritations, my wife is much better. Her calmness in such bothers me on occasion because I feel the innate husbandly suspicion that she is superior.