Up to the point where you had to delete the picture and prove it to the other guy, the PO was probably just doing his job. Not that it wasn't annoying and maybe even somewhat degrading. The deleting pics stuff is another story. I might stop by the precinct and depending on the attitude you get either have a friendly talk with his SGT or LT, or make a formal complaint. And I am a pretty big fan of the boys in blue for the most part, but it doesn't do anyone any good to have them walking around making up intrusive rules as they go along.