When the expected out come does not happen ,one tends to get upset, angry .  while we are in this state of mind, we tend to take out our frustration on others.we become grouchy.we loose our cool and react negatively to every situation.
The boss yells at the officer. He shouts at the clerk. Clerk goes home and takes it out on his wife etc.
While it would be nice to be able not to be offended,it is not something any of us can  do. The next best thing is to see how soon we can regain our composure. Several techniques can be used for this. But for anything to happen ,we have to first accept that we have lost our equilibrium and our equanimity. At the same time we should also be aware that this state is not something you want because of the problems it can lead to. The very fact of your becoming awsre will quench the fires raging within you and help restore your mental balance.