What's a "neighbor"?
If the sound of an ATV is loud enough to disturb deer then the neighboring hunter is too close to the property line.
I'm sure the person who is being cited has had problems with hunters trespassing, probably tracking wounded deer or seeking to drive them off the property and into the sights of fellow hunters.
That is what we go through here on our property, which we do not allow to be hunted. Yet the "sportsmen" stand right under our posters facing into our property.