ask citybass how he does it, i think he uses a stick lure in the rapids.
joking aside.
flossing is type of snagging. more of a pro/veteran/bored fisherman with more experience and expensive gear just aim better. some times for roe, some times for sport, not intended to keep the fish for dinner.
but a true snagger is some one with trolling rod, braided line, no leader and uses questionable type of bait.
i judge people on their rod and the line they use(salmon season only), but i never judge people based on waders. i use 50 dollar hip waders and my rod/reel can buy 3 simm g3s.