We can squabble all we want about definitions in an attempt to outsmart the anti's on trivia, or we can call a spade a spade and defend it. An AR is a rifle born and bred for fighting. Hunting with one is akin to using a flathead screwdriver to turn a phillips head screw. It can be done, but there are better tools.
The more we pretend that ARs are no more useful in combat than a lever action rifle, the more we look like nut-jobs with our heads in the sand. Eventually, we'll drive away any logically minded gun owners who are afraid of getting lumped in with the whackos.