Being lied to, mistreated, used, & stabbed in the back.(To put it short because you know this list could be endless and touch every injustice in this world)
But is is a very humbling thing to realize that I fall short too and do things on purpose and by accident that angers others at times too.. So one wrong is no different than the others. I don't know if it was in there heart to hurt me or not is the thing.
There intent isn't always what's important- but trying to learn and understand where & why they act out in such a way is more important because it can help with there healing.
God loved me even at my worst and didn't disown me because I acted out in the pain that was inside me- instead he caused my healing to come through his amazing grace, love, & mercy that made all the difference in the choices I made in the future.
Do you get what I mean- some people are hurting so bad that all they know to do is lash out making you feel there pain & it causes anger -when really all they want is love-the type of love they have never had that will completely change them from the inside -out!
If no one would ever make me angry maybe I'd never know they were in pain or maybe my anger teaches me in the end where I need to be stronger and pray even more! This is just my thoughts on the matter :)