I think being arrogant only hurts the person who is arrogant because there is no way others would want to communicate openly with the person.
An arrogant person is weak and she is afraid that others won’t take her seriously. Everything results from the opposition of power: having the fear of being ignored makes one speak forcefully.
B seems to think everyone is bad, when Mil seems to think everyone is good. Maybe they are both right: it all depends on how one manages to present one’s energy.