I was OTD for a while a bunch of years ago. I had no anger at all towards my parents. I had a lot of anger towards different Rabbeim I had in yeshiva, such as:
The one who called my parents shegutzim, when he said “Only shegutzim go to college. Are you a sheigitz?”
The one who accused me of something I didn’t do, in front of the whole class. When I denied doing it, I was kicked out of class – for 3 days. I found out that someone else had admitted to it. Why was I punished? Because I denied it, and it’s chutzpah to disagree with the rebbe.
The one who sent me to kindergarten for 2 days when someone lied about me to get me in trouble. When the lie was found out, nothing was done to the other boy, because his father is a rebbe in the yeshiva.
The one who walked over to me and roughly stuck his hand into the shoulder of my shirt. He said he wanted to be sure I was wearing tzitzis.
The one who, without warning, went through my private possessions in the dorm and threw out whatever he felt was inappropriate. No warning to take it home, just threw it all out.
There are others, but I think this post is getting too long.