a value judgement
A judgment about someone or something based upon one's own personal beliefs, opinions, ideologies, etc., rather than objective facts or criteria. Their decision to fire him seems like a value judgment, as the manager has expressed in the past how he disliked Mike on a personal level. I implore you, ladies and gentlemen of the jury, not to make a value judgment when deciding my defendant's fate. You can't convict just because she disgusts you at a personal level—you have to decide whether she broke the law or not.