This was after a guy had dominated a discussion, declaiming at length and raising his voice to talk over the other participants. He even bulldozed those who were trying to agree with him. He brooked no contributions.
We see a parallel in actual behavior. There are people who always have to be the boss, the decider, the center of attention. Some of them fail repeatedly. To them, being Number One is much more important than doing something well.
Most of them have difficulty working with others, especially when they have management or leadership responsibilities. People go along with them, but without energy, enthusiasm or imagination. It’s not fun working with such people. It’s a morale killer, making for mediocre performance.
There is a real question as to whether people who love authority should ever be allowed to have any. To them, power over others becomes a possession to enjoy, not a responsibility to manage. They see themselves as smarter and better because of being the boss.
Are all those examples of too much confidence?
No. Any one of many personal and attitudinal faults can lead to such behavior, but too much confidence is rarely one of them.