>it shouldn't really be a big deal if someone took your picture at a nude beach since youre fine with the public seeing you that way

You are just absolutely incorrect. There is a massive and appreciable difference between me being okay with a small group of like-minded individuals seeing me nude at an event or location specifically intended for this, and my nudes being published for literally billions of people to see whenever and wherever they want without my consent.

Do you not see that?