When is it halachically permitted to hate someone? I’m not asking what is recommended — there are actions that have already happened. I need to know the halachic ruling.
It is permitted to hate somebody who is classified as a rasha, meaning somebody who wilfully transgresses prohibitions that are known as sins. Poskim add that one may only hate him after he has been admonished, yet continues to transgress. If the sin involved is a personal affront or injury (such as public humiliation), some permit hating the offender.
Sources: See Pesachim 113b; Rambam, mitzvah 302 (prohibiting hatred “in the heart”; other rishonim write that even outspoken hatred is included in the prohibition); Shulchan Aruch, Choshen Mishpat 34 (concerning who is considered a rasha); Minchas Chinuch 238 (it is permitted to hate the wicked even in one’s heart); Rambam, Rotzeach 13:14 (concerning the obligation to admonish before hating), and Chofetz Chaim (chap. 4, note 14); Tumim, no. 7, and glosses of Baruch Ta’am (concerning hating somebody for a personal offence). When it is not clearly permitted to hate someone, one should not hate the person but only his (possible) wickedness.