I would not say that guys doing 3D are not courteous...3D for me is a trance! its nirvana!! Thats why a 3D pilot likes to hover or torque roll his plane at 2 feet! Its certainlly not with the intention of creating nuisance...How many pilots who do 3D would not second me?? I feel 3D/Hovering is a feeling that is achieved only after one does it! So its kinda difficult for a non 3D guy to appreciate it as much as a 3D guy would... At the same I have all the respect for the non 3D guys..
So I would agree with bob by rephrasing his statement a bit!

"The 3D guys need to be considerate, the warbird guys need to be tolerant."

Lets appreciate all forms of flying rather than debating on these petty issues! long live RC!!

cheers!