Accidentally stumbled onto a nude beach once. Got nude to not feel left out. I don't even take my shirt off outside in the summer because I'm so self conscious.
This happened to me and my friends as well but on arrival we got instantly yelled at by nude people for not being nude. It's not like we were staring at them but why is it so bad if we wouldn't be naked? (Assuming we mind our own business)
The reasoning is that if you allow clothed people on the beach, you'll get more and more clothed people until naturists are a minority and don't feel comfortable getting naked. And because naturists don't have a lot of places to practice it, they are quite protective of the few places they do have.
I don't know. I would just assume if you're clothed, you don't really need to be on a nude beach, and I'm sure there are enough pervs sitting around watching.
There's really no reason to be on a nude beach unless you're going to participate. Usually there's a clothed beach right next to it.