Those people are called "Fudds"... The old folks (typically wing shooters) that sip brandy and smoke cigars at their multi-thousand acres ranches, and don't think AR's are modern sporting rifles that are very viable hunting guns, and that as long as they have their O/U & SxS shotguns and bolt-action rifles, that's all you need.
Don't get me wrong, I love my O/U's and my bolt-actions, but I also love my AR's. The sheer versatility of the AR platform is more than enough to prove relevance, at the very least. But these Fudds refuse to acknowledge any hunting/sporting weapon technology designed after 1900. The NRA's board has been infiltrated with many of these Fudds for nearly 60 years.