To start with, I try as much as possible not to get angry - whether at people or at things. I see anger as a gross manifestation of one's weakness. Yes, I get pissed off but not to the extent of getting angry. Relationships have been destroyed, lives have been lost, wars have been started, and terrible actions have been taken due to anger. I would not want to look back at myself and feel, hey! I should not have been angry!
That being said, what pisses me off really bad is injustice. It eats me up deep when I see injustice being perpetrated and people are just moving about their ways as if nothing is happening. One thing about injustice is that it always go round. You might think it does not concern you today and therefore you will rather keep mum or not take any action, there is more than enough to go wrong. SO, yes, injustice pisses me off but I try as much as possible not to get angry.