Do you have a copy of the incident report? It may contain a different version of events than the one you relate here, and it would be helpful to know their version.
I plan on going back to the police station tomorrow to get the report ( I was there last week but it wasn't ready yet) hopefully it doesn't have any unexpected details on it
A prosecutor should not pursue a charge unless there's at least probable cause that a crime was committed, and that the person accused is the person who committed the crime. Here, it's not clear that a crime was committed. If the prosecutor finds nothing more to have been involved that "the bird", the prosecutor should dismiss the charge.
that's what I'm hoping for and if the charges aren't dropped that's what I'm going to argue in court
I don't believe that there are any remaining jurisdictions in which offensive words or gestures, of themselves, as directed to the police would be deemed "fighting words". When it comes to provocation the police, quite correctly, are held to a higher standard of conduct than members of the public. See, e.g.,
Hammond v. Adkisson, 536 F.2d 237, 239 (8th Cir. 1976), addressing offensive language (Missouri is in the 8th Circuit). The language in that case seems considerably more provocative than the gesture described here, and the analysis should be similar. (The OP's effort to turn his actions into political speech seem, to me, to be a lost cause under the facts, but that's not necessary.)
thanks for that link, I've been looking for cases in my state or circuit
Once, many years ago, my brother 'gave me the finger', and I thanked him and kept it for about a minute before giving it back (don't worry - it remained attached to his hand). He was subsequently considerably less "giving" with his digits, at least to me.