I looked up Resentment in a book of quotes years ago (don't ask why..) and read this
There is a spirit of resistance implanted by the Diety in the [heart] of a man, in proportion to the size of wrongs he is destined to endure.
so in other words, if you see someone who has a bad attitude, maybe he or she has "endured" much "wrong" But people just make things worse by rejecting the person for his bad attitude... I am not saying i haven't done the same thing... regretfully