I hate that sound. It's not even a sniff. Snarf is a good word to describe it. It is GROSS! I have several male aquaintances that do it and it drives me crazy. I've even handed them the kleenex box before as a hint! It's just a nasty habit and I think many folks probably don't even realize how much noise they are making and how bothersome it is because they've been doing it so long.

Maybe you should offer them an antihistamine for their "post nasal drip". Hehehe!