All there are are

JKBelieve"There are neither men nor women in the world anymore. There are all feminine men."

Is the above sentence grammatical? Can it be improved?

I don't know exactly what you want to convey. It's you who only knows. Post your sentences and we will correct them.

It's ok, but I think it could be a little bit better. Perhaps something like:

"There are neither men nor women in the world anymore: all that remain are femine men."

The colon makes it a bit stronger, and changing 'there are' to 'that remain' avoids the repetition of 'are' and the resulting dubious comma that separates subject from complement.

What I meant to say is

"There are neither men nor women in the world anymore. The only types of people there are in the world are feminine men."

I was wondering if I could shorten the sentence into

"There are neither men nor women in the world anymore. All there are, are feminine men."

JKBelieve"There are neither men nor women in the world anymore. All there are, are feminine men." Is the above sentence grammatical? Can it be improved?

It's grammatical. A comma between the subject and the predicate is generally cautioned against, however. "All there are are feminine men."

To avoid "are are", you could rephrase:

There