Feminists on the moon

My psychiatrists believed I was a pathological offensive joke teller. To prove it to me they brought in a bunch of feminists and asked me to tell a joke that wouldn't offend them. So I came up with this.

"What do you call a feminist on the moon?"
"We don't know," says one of the feminists.
"A problem," I reply.
The feminists looked unamused at my answer.

"What do you call 10 feminists on the moon?"
No reply.
"A problem."

"What do you call 100 feminists on the moon?"
Again, no reply.
"A problem."

"What do you call 10 000 feminists on the moon?"
This time the feminists looked like they were starting to understand the joke.

"A problem," replies the feminists in the middle, "because the world needs every single feminist," she explains.

I give no reply
"What do you call all the feminists on the moon"
The feminists look eager to hear the next line.
"Problem solved"