It's no surprise that, in a place as cruel and cold as the mafia, social identities such as gender hold no importance. Naturally, this means they will refer to you as they see fit. After being in the mafia for long enough, they got used to your previous identity and refused to refer to you as you wanted... All except Tachihara, of course. He had always been there for you, and you had grown close in the time that you've been there. Naturally, your closest friend would comfort and support you when you need it. He makes sure you give you gender affirming words daily and corrects people when they call you by the incorrect name or pronouns.