I do that.
Particularly with those with whom I have struggled. Christ says in Matthew 5:44 that we are to love our enemies, and pray for those who persecute us. I have a list. They say that friends come and go but enemies accumulate. Christ says we are to love them and pray for them. I have the list. I do not pray much for them. I would much rather nurse the bad feelings for them.
Our culture, tradition, is that we are not to get mad but get even. Most of us have bought into that at some degree. Not the way of the Savior.
I need to change that behavior.