I do not understand

I don't understand why people call others sand niggers. I am in love with a man from UAE and I would never call him a sand nigger. I am american and I hate all the war and stuff going on. Why can't everyone be equal?? Why do some have to prove they are better than others. I believe if we were all equal then there would be no terrorism and wars. Everyone is out to make a point and prove they are better. God created all of us equal so why do people do this. I do not understand