Western culture is so obsessed about suppressing anger at all costs. Like each person is a nuclear weapon that needs to be aggressively contained or else the entire fabric of civilization will collapse.

Anger exists for a reason and it exists for good reasons. The manifestation of anger means some model you are holding onto is no longer in sync with reality and that resynchronization costs more than your time preferences will allow. (Using the authors scenario, your expectation was for a reasonably timed phone call, not a 35 minute wait.)

It's not that anger is wrong. The anger is correct. The expectation was wrong. The West automatically assumes all instances of anger are permanently wrong, and this child-like ritual prevents one from appreciated the value of anger as a compulsion that tells you in no uncertain terms that your expectation is completely out of whack and you need to either cut your losses or resynchronize the expectation.

Anger becomes fuel for remodeling reality once you understand what is is trying to tell you. Putting taboos up around it prevents this realization, which in turn, creates people who are trained to perpetually cling to false models of reality out of fear of violating the taboo.