I guess it is just me, but I spend a decent amount of time at the range in "camo". I'm not a big fan of running around in the mud and muck which is often at my range if I am wearing most of my clothes. However, I have 15-20 sets of cammies from my days in the Marine Corps. If wearing a pair of them to the range makes me some tacticool mall ninja or some violent idiot- then so be it I guess.
If I'm shooting a match I do tend to wear more acceptable clothing. If my range is actually dry for once I'll usually be in shorts or kahkis and a polo. But I refuse to feel bad about wearing camouflage clothing to the range.