I have this as well.
If someone coughs repeatedly, like every few minutes for hours on end, I feel like I just want to scream "STOP COUGHING!" in their face.
The same goes for people chewing loudly. It seems that it is mostly related to sounds coming from the mouth or related to the mouth.
RE: Ever Wonder Why you HATE it when people SMACK on FOOD CHEWING with there MOUTH OPEN !!!!!????!!!!! MISOPHONIA Maybe?!!