Do not hate in one’s heart any decent Jewish person
“Do not hate your brother in your heart” Vayikra 19:17
Should one man sin against another man he should not bear hatred in his heart and keep silent.
Either forgive and forget or the religious duty is to make this known to the other person and say to him “why did you do so and so to me?”
and erase the hatred from his heart.
However, if he saw the person sinning and warned him to turn back and he refused then he can be hated.
Hatred caused the destruction of the Temple and our long painful exile. Holding on to past grievances does no one any good.