Intolerance of others can have various causes, just like most other symptoms. Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.
Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms. In order to diagnose intolerance of others, we could:
How well do you tolerate other people's mistakes and shortcomings?
Possible responses:→ I am not critical; I tolerate/forgive easily
→ I occasionally have difficulty tolerating people
→ I'd say I'm about average / don't know
→ I am sometimes excessively critical
→ I tend to be critical, unforgiving, quick to judge