There are many guidelines that emphasize the importance of being
kind. Being friendly and open to new people is wonderful. But 
use common sense when you find yourself in threatening 
situations. It is ok to change seats if the person sitting next 
to you on the bus is really bothering you, or to hang up the 
phone on unwanted calls.  It is the right thing to do to not 
volunteer information you consider private, and to call the 
police if someone is threatening your safety.  
Being prejudiced and close minded is bad. But being sensible 
protects you and your loved ones and is the right thing to do.