It sounds like (C)APD but with emotional involvement. In both, you can't get used to the sounds everyone gets used to (ac fan, talking in the next room...) But in misophonia, this equals rage.
List of Mendelian Traits in humans, where genetics dictate whether you have something ot not. Like fused or hanging earlobes, or dry or wet earwax.
Phenylthiocarbamide--the chemical your genes tell you if you can taste or not. Smokers and coffee drinkers are not sensitive to it, indicating the role of environment as well.