Since I live here too; I can tell you there are a few City LEOs who do not like OC from a personal standpoint, although legal, they will challenge you to CC. However, there are many who don't care...unless you are being stupid with it. The reply you got doesn't surprise me.
As for it rarely occurring, well that is subjective. For that LEO, he may think it rarely occurs because they get very few calls on it; but the fact is, it does happen frequently. Most of the incidents are fairly benign.
The one place, outside of the other posted places, that will cause you harassment is Battlefield Mall; they don't like CCW there, let alone OC. They even have it posted as your driving onto the premises that you can't have a weapon in your vehicle. The former mall manager enjoyed demonizing people with firearms in that public setting, if his rent-a-cops ID'd you as a CCWer, he would try a public flogging. Fortunately, I heard this weekend he is no longer there, so I don't know what they will be like; however, the corp policy is to ban weapons on the premises.
Most of the grocery stores are OK; Price Cutter is fine. I'm not sure on HyVee or Dillons.
As stated discussed on the FB page, keeping a low profile and unwanted attention is key until we get something from the gubberner.