Misophonia IS a disorder since it implies an EXTREME abnormal reaction to certain sounds. Anyone can be made uncomfortable by certain sounds, just like anyone can become uncomfortable by being locked in a closet or seeing pictures of the deep, dark ocean, but people with misophonia will tend to have a reaction along the lines of triggering fight or flight response which they tend to have trouble resisting action upon.
I didn’t 4 years ago but now I do only if I know the person who’s chewing... who is most likely my guy friend he eats like there won’t be any food for months
Being disgusted by someone with rude table manners, in itself isn't abnormal. As someone with severe Misophonia I can assure you the reaction is not nearly as mild as disgust. For me the noise draws immediate fight or flight. I'll tolerate it for about 10 seconds before I either tell you to close your goddamn jowls when you chew, or I will have to get away from the noise. To the point where I can honestly say that in a situation where the smacking was inescapable or unstoppable, I will, for a certainty, kill you, if I'm able.
It's a disorder, technically
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Supposedly in some countries it's considered rude if you DON'T make a lot of noise while you're eating