But chewing anything with your mouth open is considered annoying/rude At least where I'm from.

It only bothers me when people chew regular food like that. It makes me EXTREMELY pissed. For some reason, it doesn't bother me when people chew their gum like that though. Idk why though, I'm weird lol

Nasty

so goddamned irritating. my coworker chews nicotine gum all day long and she makes this disgusting, guttural chomping noise. Like OMFG, STFU. The irony is that she one time said she hates when people do it. I don't know how to go about telling her to stop.

There's a condition called Misophonia where people are extremely sensitive to certain sounds that trigger a violent or overexaggerated reaction, and gum chewing is a very common trigger. Needless to say, i've self-diagoned myself with this condition. My sister "has" this condition too.

Eating with your mouth open is much as annoying as chewing a gum with your mouth opened.

Omg I know right!? That is disgusting.

It's annoying af. but a thing even more annoying is when people are eating soup and they literally suck the soup out of their spoons instead of putting the spoon inside their mouth and it makes that disgusting noise. I literally can't eat for the rest of the dinner

I'm gonna vomit

OMG, sis you must be a youngin to be disgusted by something like that.

Because when you're chewing other foods, you are swallowing it afterwards and inhaling air when your mouth is empty. In the case of chewing a gum, it stays in your mouth until you take it out. It would be uncomfortable for some people to keep their mouth shut while chewing a gum for, say, 30 minutes. That was just an explanation for that question above, but I don't like it when people chew gum with their mouth open as well.