The gay panic defense or homosexual advance defence is a victim blaming strategy of legal defense, which refers to a situation in which a heterosexual individual charged with a violent crime against a homosexual (or bisexual) individual claims they lost control and reacted violently because of an unwanted sexual advance that was made upon them. A defendant will use available legal defenses against assault and murder, with the aim of seeking an acquittal, a mitigated sentence, or a conviction of a lesser offense. A defendant may allege to have found the same-sex sexual advances so offensive or frightening that they were provoked into reacting, were acting in self-defense, were of diminished capacity, or were temporarily insane, and that this circumstance is exculpatory or mitigating.
This has no bearing on the admitted facts or evidence. The goal is to prevent the defense from basically saying, “They deserved it because they were gay/trans, and that surprised/scared me so much I acted violently.” It’s like saying you punched someone because they were wearing a different colored shirt. It’s not okay to hurt someone because of who they are.
The law was passed to prevent victim blame and to make it clear that being gay/trans isnt scary. People are people. And violence isn’t okay, even if one’s bigotry causes them act irrationally.
EDIT: Updated to simplify what I was trying to convey