This incident was reported to Ranger Nelson who reportedly went out to the horse ranch and interviewed a resident. That means there is an Incident Report, that means your visit to the horse ranch has turned into a "Federal Case". Therefore, this is not hearsay; an official law enforcement report is on record.
Doesn't sound very friendly for a "Friends of Juniper Flats" member. I wonder how your unneighborly behavior may affect your Inspector General investigation?