Obviously both would come as a shock, but weirdly, I'd feel way more comfortable handling the drug addiction because I could relate to it and empathize more. Meanwhile, I'd struggle to remain intimate with someone fumbling to explain how they thought hurting others was okay at any point in time.
Never been in a relationship but probably the drug addiction too. If they bigoted they probably saying things behind my back or will if we ever break up. If this the case I don't think I could ever share anything deep or personal with them.