I have familly in the Boise area and frequent the state, I OC everywhere I go. I must say that I have had no real issues. What you run into there is the "staunch republican" who firmly believes in the permission slip that he petitioned the Government for.
I usually just leave em with a thought, and it is effective. I go to the same events there year after year, and he OC participants have doubled every year. ***success***