Everyone is someone's difficult person

I was doing some end of the term office cleaning today and I came across some notes I took during my mediator training.  (I'm a mediator, did you know that?)  On my notes was the statement "everyone is someone's difficult person."

My first thought was "Yikes! Surely not me."  But probably yeah, I'm someone's person, just as we all are someone's difficult person.

So what can we do about this?  For me, it makes me remember that as I would hope someone would have patience with my idiosyncrasies, I too should have patience for those who I feel are "difficult."  We are not always aware of the effect we have on others, and sometimes we're simply just not compatible with everyone else.  But losing one's temper, starting arguments or "wars" will never really work because someone being described as "good," "bad," "nice," "difficult," etc. is all subjective and while most people find me to be a rather agreeable person, I'm sure there's someone out there who feels that I'm their difficult person. 

Are you someone's difficult person?  What can you do today to become more tolerant of your difficult person?