The distain of "car camping" is similar to what some hunters think of other people's hunting preferences. Many hunters seem obligated to categorize and prioritize particular methods of hunting. Canned hunts are a disgrace. Guided hunts inferior to DIY hunts. Hunting over agriculture fields is less than 'big woods' hunting. Gun hunters are less than archers. Compound archers are less than traditional hunters. You get the picture.
While their method of 'camping' disgusts you, if may be high quality family time for them, and since they're not very far from major roads, what harm can they be doing to you? That they still call it camping doesn't demean what you do.
Please don't get me wrong; while I don't get to do it much, last time I took my son camping, we slept four nights in jungle hammocks right outside my friends cabin. To me, campground camping isn't camping at all, but if your fat, sweaty sports fan wants to call his weekend 'camping', let him.