Simple. You obey the rules of the language, which are that pronouns are determined by the sex of the referent. So any man, whether a rapist or not, is free to call himself trans and live his life in whatever way comports with his understanding of that concept, but the rest of society is not forced to state untruths and kowtow to his feefees. What power does he have to compel anyone else to state a lie? He is free to call himself whatever he wants, but having a meltdown if he can't force others to go along with it is a sign of emotional immaturity and mental illness. It should be treated, not indulged.