Believe it or not, most cops have already decided what action (Ticket, warning, etc) they are going to take before they even speak to you. They base it on the severity of the violation and whatever department policy is.
I have given some real loudmouthed a##holes warnings because that was what was warranted, regardless of the attitude. Most cops actually stick to that.
Interesting. I always wondered if my Texas 100 sticker made any difference. I figured probably not but I'll continue to participate anyway.