As a human being, anger is a part of our mind. Irritation also part of our mind. But you can do - anger come, go. Never keep in your sort of - your inner world, then create a lot of suspicion, a lot of distrust, a lot of negative things, more worry.
To give and receive advice - the former with freedom, and yet without bitterness, the latter with patience and without irritation - is peculiarly appropriate to geniune friendship.
I am sometimes sad when I hear the personal stories of Tibetan refugees who have been tortured or beaten. Some irritation, some anger comes. But it never lasts long. I always try to think at a deeper level, to find ways to console.