Definitely not Felony Menacing. Maybe flat out Menacing which is a misdemeanor but I am thinking more Disorderly Conduct. Everything fits but the venue.

18-9-106 (f) Disorderly Conduct

Not being a peace officer, displays a deadly weapon, displays any article used or fashioned in a manner to cause a person to reasonably believe that the article is a deadly weapon, or represents verbally or otherwise that he or she is armed with a deadly weapon in a public place in a manner calculated to alarm.