Some people can’t breathe, through their nose.
If that’s stopped up, then you aren’t even able to eat, as nature intended.
I feel like this is the same as loud mouth-breathers.
It’s a situational awareness, and awareness or lack there of, thing.
Some people make “biological” noises, all the time. I often wonder, can they hear other people? That’s why I am fairly silent.
In my own house, I have serious problems, with people who voice issues with my etiquette. I have, and still will, drag a disrespectful person from my area.
It’s situational though. I would try to adhere to most public standards, if the occasion called for it.
Honestly, if I detected that something had decided to be offended by me, ya know because they’re not an animal, I would probably try to be more offensive.