Gods, that has not been my experience at all. I don't think there are enough guys who are into camping. NorthFl makes a great point, in that many gays (like many people in general) associate camping with an RV, instead of real camping in a tent, miles from the nearest piece of asphalt.
I don't really care how camping makes anyone look, but I find nothing better than laying out under the stars with a hot man by my side, with maybe 2 or 3 people within a five mile radius. The backcountry is serene and gorgeous, and the best way to experience the wildest of the backcountry is to take a tent and sleeping bag out and hike for days on end. The beautiful natural sites you come upon, the critters you spy, and the clean, crisp, quiet atmosphere is like nothing else in the world.
Just thinking about it makes me want to go camping right now. Any guy who can be just as happy leaving behind the creature comforts for a week or two and strapping on a pack is just that much hotter to me. It has nothing to do with masculinity; it has to do with being able to enjoy the non-material life at times.