Question: how to deal with an angry unreasonable person?
Answer: Listen. Listening is the number one step in dealing with "unreasonable" people. ... 
Stay calm. ... 
Don't judge. ... 
Reflect respect and dignity toward the other person. ... 
Look for the hidden need. ... 
Look for others around you who might be able to help. ... 
Don't demand compliance. ... 
Saying, "I understand," usually makes things worse.