Everyone keeps saying " he was a jerk" ...... last time I knew, that wasn't illegal either.
You have the "right" to be a jerk, to be a real pain, etc. without someone seeking punishment for it, because he's allowed to be a jerk if he wants to be.
I don't think he was being a jerk, I think he was pointing out things they didn't want to hear, and got charged because of the "don't challenge us , or we'll find something to arrest you for " mentality. Often, that includes apparently if you are defending that what you were doing was not illegal at all.