Are you cordially acquainted with this idiot? If so I would talk to him about it and say that since things are already cool with the town there is no need to make a point. You can leave out the part that OC'ing to make a point and looking like an idiot does not help anyway.
If you are not in a talking relationship with the man it is up to you if you would like to say something to him. I hate when folks do that.
I OC'ed yesterdday on a well populated trail for Memorial Day weekend (most folks from MA, NY, or CONN) and even then I only saw one couple that looked at me and whispered something. Some folks asked if I was a ranger which I replied I was (Army ranger LOL). I then said no, but I will be hiking home when it is getting dark and it is for protection from wildlife. (funny thing is I did see a bear on the way home). They all thought it was cool. Including the forestry folks I ran into. If you OC like it is part of yoour style and routine most folks don't care or notice.