This is not true, I believe you are referring to the whole Going Armed To The Terror of The Public thing. If a person does call in MWAG thats their fault for being scared and as long as your firearm is being openly carried and your not waving it around trying to terrorize anyone everything is fine. Now that's not to say that the local LEO will not respond and check you out. I ride a sportbike (crotch rocket) an open carry on my right hip a full sized XD 45 acp and not a single negative reaction....yet. I'm pretty sure more people will chime in with more knowledge then I and maybe explain it a little bit better.
Going Armed to the Terror of the Public
This is a common law offense (272 N.C. 535; 32 N.C. App 495).
A person guilty of this offense
(1) arms himself or herself with unusual and dangerous weapons (firearm)
(2) for the purpose of terrifying others
(3) and goes about on public highways
(4) in a manner to cause terror to others.
In order to be charged, all four conditions need to be met.
-a firearm openly carried on the hip does not constitute as gatttotp-