You are doing nothing wrong and rooster tails work great there. The "rule" against lure fishing is implied but I'm surprised you got more than just dirty looks. If you want to you can glare right back and spin fish those waters pretty well with various flies on a leader off of a clear plastic bubble. Google "Fly and a bubble" technique. Works great with Pistol Petes.
A fly rod setup doesn't cost that much and you know it's not a bad thing to have in your arsenal. Biggest expense used to be the waders and shoes and you've already got those! Start acting like an entitled prick and people with think you are a fly fisherman! Fish will eat flies real well a lot of times when they won't hit hardware. Good to know for lake fishing too where you won't get the stink eye. . .