The phrase "hate to celebrate" can be understood in different ways, but one possible interpretation is that it refers to a feeling of discomfort or ambivalence towards festivities or special occasions. As such, there are several possible synonyms that one could use to convey this idea, depending on the context and tone of the message. Some examples include: begrudge, disdain, loathe, resent, or reluctantly commemorate. Each of these words captures a slightly different nuance of the negative feelings one might experience when faced with the pressure or expectations of participating in a celebration that goes against their natural tendencies or preferences.