It is a known fact that your friends and family members can frustrate you and do the most annoying things but we should also note that getting angry would not stop them from doing those things.
We should also know that getting angry with people do not change them rather we should work more on understanding them and learning to ignore when pissed off.
I use to have a friend that says the worse of words to anyone at her angry moment and apologizes when the anger fades off. That few minute of anger is enough to destroy a long time relationship.
The moment you realize that nobody actually makes you angry you are the one who made the choice of getting angry then you would know that the act of getting angry should be a past in your life.