You are on the spiritual path and you think you should never get irritated.  It is all part of learning to flow.  There will be many moments when you are fully human—when your anger flares, when sadness arises.  In the past, you may have resisted such feelings or you may have wallowed in them.  When you flow, you are more aware.  You allow feelings to spike and then you allow yourself the luxury of feeling what the optimal state is now and now and now and now.  And thus you flow.  And the more you flow, the less you feel like wallowing.