I'm the same way. I'm very easily annoyed by people's noises, like loud breathing, sniffing (especially when I'm taking a test), throat clearing, swallowing. I used to be really annoyed by eating noises and I can't stand eating around my dad because whenever he drinks something he opens his eyes really wide like he's seeing a horror movie or something, but luckily now I just eat alone in my room so none of it can bother me. I also can't stand the sound of dishes clanging, mostly because it seems like my dad makes as much noise possible while doing it.
This reminds me of when I was in college and was taking a final in a huge room with a ton of people at the end of winter quarter. Someone in the room kept sniffling, coughing and sneezing. Many people were doing this, but one in particular was louder than the others. She sounded really uncomfortable. Well, someone in the room got really annoyed by this and shouted out for her to be quiet. He was reprimanded by the test proctor because it was pretty rude and disruptive, but a little bit later, he started yelling about why didn't she take medicine, stay home, shut up, etc. It was so loud and way more disruptive than the sniffler. He got kicked out of the room and I assume failed the test. It was pretty crazy and made a boring statistics final a little more interesting.