you can have your heart to heart over whatsapp... the reason it's annoying is very primal... kinda like a guy eating with his mouth open making all those noises or talking while eating... it's not your food... or your mouth... or those guys who laugh aloud at their jokes in a social gathering... I am yet to place a finger on it... but I guess it's also in the same group as shooting mucous from one's nostrils (by covering one nostril) and blowing really hard! The guy may not be aiming at you... it's not your nose and the grass where the mucous lands is not your face but it's annoying/uncouth.
Bad manners and uncouthness normally are things that don't affect the other person physically but annoy them.
All Mushrooms are edible! Some Mushroom are only edible ONCE!