I have a nearly fully blocked nose, always have. As such I can’t really breathe through my nose at all (also my sense of smell is nearly nonexistent). I still eat with my mouth closed. It does take me a while longer though, since I basically need to stop eating in order to breathe. But I’d rather do that than the alternative, because I agree with you, chewing with your mouth open is disgusting and disrespectful.

I’m going as Joe/Manco/Blondie from the Dollars trilogy. My girlfriend was originally going to go as cowboy (cowgirl?) Barbie but that might be changing now