Got to ask. Why would you tell the officer you are carrying? It's really none of their business unless they ask if you are armed.
Questions that do not pertain to why I have been stopped, such as, where are you going, really bother me. I tell them the following. Your question officer, does not pertain to the matter of why you stopped me. Not that I have been stopped much but the officers I have made this statement to really had no reaction and stopped questioning.
Like the OP, my interaction with police officers over the past few years left me feeling the same.
In some states it is mandatory, in others it is a courtesy. If he would have run my license he would have known. It was my choice to let him know beforehand. He did not run my license and instead of giving me a load of crap or a ticket he let me know I had a light out and wished me a good day.
So, how was I wrong and how did it cost me?
