I don't think there's anything I can do, so I'm just venting. The guest is not a smoker. They have a horrible snort-grunt thing they do, drawing phlegm.
The snorting is a sort of gargle/drawing up phlegm, and is then swallowed.
Waking up: lots of snorting. You can hear it from their room.
Shower: lots of snorting, blowing their nose in the shower.
Mealtimes: lots of snorting. Puts me off meals.
Random times: snorting.
In public/public transport: snorting. People look at our group, like wtf.