it currently is not illegal But very unethical and not socially acceptable,witch is why you are receiving so many bad comments from people and everyone agrees with them. NEXT YEAR on places such as the salmon river,willamette,McKenzie,trask,3 rivers there will be many gear restrictions including but not limited to leading length restrictions,hook restrictions and fishing in some waters will be limited to bobber angling,metal based lures and fly fishing.
i also cannot remember but im pretty sure the are changing the definition of snagging too.
if a state cop sees you casting a corky and plunking it or drifting it and setting the hook often you might get a ticket depending on the officer
ive see people flossing get tickets but not very often