I'll have to agree with the 'people leaving stuff behind' as really my only pet peeve. My family didn't camp when we were kids, but my friend's family did and they took me with them all the time. The one lesson they instilled in me was "always leave the campsite cleaner than it was when you go there" - which is not all that hard to do these days. Loud, obnoxious campers don't bother me at all - I usually find it amusing (although I don't have kids, and I could see how that might change things). I have zero problem taking care of my business in the woods if need be, so I don't care if the bathrooms are nice or not. Someone did mention one thing though - dogs. I am a dog lover to my core, and I have no problem at all if a dog wanders into my campsite. If the dog appears aggressive, I also don't mind appearing aggressive right back at the dog to level the playing field. My dog is still a puppy and still learning how to behave, so I keep her leashed at all times - I think that even when she's older and has calmed down a little I'll still keep her leashed though - not because I'm worried about her, but because I'm worried about how others might react. I don't blame people for being uncomfortable with an unleashed dog - not one bit - it just doesn't bother me much, and is the only thing I've ever encountered on a camping trip that made things uncomfortable with fellow campers.