Personality traits like this are on a Bell curve, so he's just talking about the "left hand corner" of that curve. The percentage just depends on your threshold for tolerance.
I know people who are convinced that 50% of people are horrible people, their tolerance stops at "anything left of the median".
My tolerance is the opposite, and I can work with even quite problematic people successfully, so I would estimate that just 1% of people make that unnecessarily difficult.
I know people who are convinced that 50% of people are horrible people, their tolerance stops at "anything left of the median".
My tolerance is the opposite, and I can work with even quite problematic people successfully, so I would estimate that just 1% of people make that unnecessarily difficult.