Anger isn’t caused directly by things that happen to us. It’s caused by our interpretation of those things. Imagine, for instance, if someone cuts in front of you in line at the grocery store. You can interpret that a couple of different ways: intentional (“he saw me and just didn’t care that he was cutting in front of me”) or unintentional (“he must not have seen me”).
Sometimes, considering alternative interpretations of the provocation can be a nice way to alleviate anger. Ask yourself what evidence you have to support your angering interpretation. Try to consider other ways of looking at the situation and maybe even try to test those alternative interpretations. What would happen if you, for example, were to say politely to the person that they accidentally cut in front of you?