There is a proverb that reads, "he who angers you, controls you." If I had to count all the people who've somehow wronged me, there would be a small phone book and one very upset handyman. In fact, the very reasons these might have happened range from these people hurting to just doing their job. It by no means excuses aberrant, non-repentant behavior (I'm not into excuses for anyone, least of all me) but it does attempt to explain the reasons, dear reader, that in fact we are not at the center of our hurts as much as we would like to be.
My biggest concern is that too many of us have ourselves as the center of our life. We claim to serve the Lord and others, when all we are really doing is trying to serve ourselves. This doesn't exclude me in the least. When I was a maintenance tech at an apartment community, there were more than a few ladies I would have liked to tell off to put it very mildly. They treated me so badly I wanted to quit. Such is the immediate and temporal nature of this life. It has taken me nearly four decades to realize the futility of such feelings of self-vindication.
Are there reasons to be angry? Of course there are, but these may or may not have anything to do with you. Ephesians 4:26 reads "Be ye angry and sin not: let not the sun go down on your anger." I don't about you dear reader, but this is pretty strict in the Lord's eyes. When we're angry, we tend to want things our way. I'm angry that so many little babies are killed every day by an industry hell-bent on "choice," and that so many are deceived in turning to false gods and heretical doctrines that can only lead to damnation. This really makes the boss who belittled you in front of coworkers seem kind of trivial, doesn't it? This really shouldn't be on the radar of someone who's a Christian. In reality, this is something I struggle with daily.