Its not specific to nudity at beaches, but more of a general thing. Expectations about what a body should look like and the extreme focus on a binary gender is incredibly harmful for everyone, since it creates boxes were everyone tries to fit into. When we AS society collectively work on demolishing these boxes it remives a lot of stress for everyone who previously had been excluded by these boxes. Realizing, that bodies are different and that it is no shame to look different from some arbitrary beauty standard, that’s unreachable for most people, is one of the best things that can happen to you.