• Most of the time when people are angry it is something within them and they use everthing and everyone else as an excuse for being irrate all the time.
• "The things you claim you don't like about other people are really the things you don't like about yourself".
• Reality Check! Think about it and be honest with yourself and help your friend to see the light.
• Understand that anger, just like any other emotion, is a choice and maybe you can help your friends choose positive reactions instead of negative ones.
• Encourage them to focus on the good in themselves and everyone else and not be so mindful of imperfections and flaws.
• if you can be patient and foster positivity your friend just may follow your example. 

via helium