It really depends on how the law in Tennessee is written but reporting a crime - which pointing a gun at a person can be put in that category - to a police officer (or in some states it is referred to as  peace officer) - can also be interpreted as filing a police report if all the information is taken down and reported and recorded.  It seems here that the police may not have taken you very seriously - which is disturbing in an of itself - but I might speak with an attorney in your area to cover yourself.  Filing a false report is a very serious offense and it can be either a misdemeanor or a felony.